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Search results for problems posted by Federico Kereki :
Difficulty: 3 of 5Greaterdoku (in General) Rating: 4.80
Posted on 2007-07-15 by Federico Kereki (No Solution Yet, 12 Comments)
Difficulty: 1 of 5Know yourself (in Liars and Knights) Rating: 4.00
Posted on 2007-07-06 by Federico Kereki (No Solution Yet, 12 Comments)
Difficulty: 3 of 5A grok is a grok is a ... ? (in Liars and Knights) Rating: 3.00
Posted on 2007-06-29 by Federico Kereki (No Solution Yet, 11 Comments)
Difficulty: 3 of 5All Wrong at the Olympic Games (in Logic) Rating: 4.25
Posted on 2007-06-15 by Federico Kereki (Solution Posted, 14 Comments)
Difficulty: 3 of 5Triple Convergence (in Algorithms) Rating: 4.00
Posted on 2007-06-08 by Federico Kereki (No Solution Yet, 1 Comments)
Difficulty: 3 of 5Some Hardy Ramanujan variants (in Numbers) Rating: 3.00
Posted on 2007-06-02 by Federico Kereki (No Solution Yet, 2 Comments)
Difficulty: 3 of 5Only one, one, one (in Calculus) Rating: 4.50
Posted on 2007-05-30 by Federico Kereki (Solution Posted, 5 Comments)
Difficulty: 3 of 5An apple (or more) a day... (in Numbers) Rating: 4.00
Posted on 2007-05-28 by Federico Kereki (No Solution Yet, 1 Comments)
Difficulty: 2 of 5How to pick 'em (in Logic) Rating: 4.00
Posted on 2007-05-25 by Federico Kereki (Solution Posted, 8 Comments)
Difficulty: 3 of 5Always greater (in Games) Rating: 4.00
Posted on 2007-04-14 by Federico Kereki (Solution Posted, 6 Comments)
Difficulty: 4 of 5Is it, or is it not? (in Numbers) Rating: 3.67
Posted on 2007-04-10 by Federico Kereki (Solution Posted, 12 Comments)
Difficulty: 3 of 5Close to Fermat (in Numbers)
Posted on 2007-04-06 by Federico Kereki (Solution Posted, 4 Comments)
Difficulty: 3 of 5Paint it black (in Probability)
Posted on 2007-04-02 by Federico Kereki (Solution Posted, 9 Comments)
Difficulty: 1 of 5For the forty-something-ers (in Riddles) Rating: 3.40
Posted on 2007-01-10 by Federico Kereki (Solution Posted, 4 Comments)
Difficulty: 3 of 5Red herrings (in Cryptography) Rating: 4.00
Posted on 2006-12-19 by Federico Kereki (Solution Posted, 6 Comments)
Difficulty: 2 of 5Horoscope Hijinks II (in General) Rating: 4.00
Posted on 2006-12-05 by Federico Kereki (Solution Posted, 2 Comments)
Difficulty: 4 of 5Horoscope Hijinks I (in General) Rating: 3.00
Posted on 2006-11-28 by Federico Kereki (Solution Posted, 7 Comments)
Difficulty: 3 of 5A square with a circle with a point (in Geometry) Rating: 3.33
Posted on 2006-11-25 by Federico Kereki (Solution Posted, 14 Comments)
Difficulty: 2 of 5Where to? (in Word Problems) Rating: 3.33
Posted on 2006-11-02 by Federico Kereki (Solution Posted, 2 Comments)
Difficulty: 4 of 5Three Periodical Questions (in Numbers) Rating: 3.00
Posted on 2006-10-16 by Federico Kereki (Solution Posted, 4 Comments)
Difficulty: 4 of 5Eight Gates (in Games) Rating: 4.00
Posted on 2006-09-29 by Federico Kereki (Solution Posted, 2 Comments)
Difficulty: 3 of 5Needed: a large calculator! (in Numbers) Rating: 2.67
Posted on 2006-09-22 by Federico Kereki (Solution Posted, 6 Comments)
Difficulty: 2 of 5Take five! (in Numbers) Rating: 4.00
Posted on 2006-09-21 by Federico Kereki (Solution Posted, 4 Comments)
Difficulty: 3 of 5As simple as it gets (in Liars and Knights) Rating: 4.50
Posted on 2006-09-02 by Federico Kereki (Solution Posted, 6 Comments)
Difficulty: 2 of 5Identical Opposites (in Word Problems) Rating: 4.50
Posted on 2006-08-29 by Federico Kereki (Solution Posted, 5 Comments)
Difficulty: 4 of 5Play fair in Europe! (in Cryptography) Rating: 4.22
Posted on 2006-06-29 by Federico Kereki (Solution Posted, 12 Comments)
Difficulty: 3 of 5Cherry picking (in Probability) Rating: 4.75
Posted on 2006-06-17 by Federico Kereki (Solution Posted, 4 Comments)
Difficulty: 3 of 5Look Ma, no integrals! (in Calculus) Rating: 3.75
Posted on 2006-05-02 by Federico Kereki (Solution Posted, 14 Comments)
Difficulty: 4 of 5Wreck out! (in Algorithms) Rating: 4.14
Posted on 2006-04-03 by Federico Kereki (Solution Posted, 6 Comments)
Difficulty: 1 of 5Three in a Row (in Word Problems) Rating: 3.00
Posted on 2006-02-09 by Federico Kereki (Solution Posted, 10 Comments)
Difficulty: 2 of 5Tug of War (in General) Rating: 1.67
Posted on 2006-01-27 by Federico Kereki (Solution Posted, 12 Comments)
Difficulty: 1 of 5Add a third (in Word Problems) Rating: 3.67
Posted on 2005-12-02 by Federico Kereki (Solution Posted, 23 Comments)
Difficulty: 1 of 5Complete the pair (in Sequences) Rating: 3.67
Posted on 2005-11-29 by Federico Kereki (Solution Posted, 6 Comments)
Difficulty: 3 of 5Boneheaded Bookie (in Probability) Rating: 3.75
Posted on 2005-11-26 by Federico Kereki (Solution Posted, 8 Comments)
Difficulty: 2 of 5Find just one digit (in Numbers) Rating: 3.80
Posted on 2005-11-10 by Federico Kereki (Solution Posted, 13 Comments)
Difficulty: 3 of 5A greek guilt (in Liars and Knights) Rating: 4.00
Posted on 2005-09-04 by Federico Kereki (Solution Posted, 10 Comments)
Difficulty: 3 of 5A quite even partition (in Numbers) Rating: 4.33
Posted on 2005-08-28 by Federico Kereki (Solution Posted, 18 Comments)
Difficulty: 3 of 5Find a subset (in Just Math)
Posted on 2005-08-24 by Federico Kereki (Solution Posted, 6 Comments)
Difficulty: 4 of 5All/Any different? (in Numbers) Rating: 3.50
Posted on 2005-08-16 by Federico Kereki (Solution Posted, 26 Comments)
Difficulty: 4 of 5Trigonometry nest (in Calculus) Rating: 3.83
Posted on 2005-08-12 by Federico Kereki (Solution Posted, 10 Comments)
Difficulty: 3 of 5Three couples, one problem (in Logic) Rating: 3.69
Posted on 2005-07-25 by Federico Kereki (Solution Posted, 21 Comments)
Difficulty: 3 of 5Prime square (in Numbers)
Posted on 2005-07-19 by Federico Kereki (No Solution Yet, 8 Comments)
Difficulty: 3 of 5Any order will do (in Numbers) Rating: 3.67
Posted on 2005-07-12 by Federico Kereki (Solution Posted, 8 Comments)
Difficulty: 3 of 5Three of Hanoi (in Algorithms) Rating: 4.50
Posted on 2005-07-01 by Federico Kereki (Solution Posted, 3 Comments)
Difficulty: 4 of 5Squaring sides (in Geometry) Rating: 4.00
Posted on 2005-05-04 by Federico Kereki (Solution Posted, 4 Comments)
Difficulty: 4 of 5Just find two! (in Geometry) Rating: 4.33
Posted on 2005-04-27 by Federico Kereki (Solution Posted, 25 Comments)
Difficulty: 4 of 5Guess a number (in Algorithms) Rating: 4.33
Posted on 2005-04-14 by Federico Kereki (Solution Posted, 19 Comments)
Difficulty: 2 of 5Counting Sand (in Algorithms) Rating: 2.50
Posted on 2005-04-07 by Federico Kereki (Solution Posted, 8 Comments)
Difficulty: 3 of 5Intuitive Coins (in Algorithms) Rating: 3.80
Posted on 2005-03-29 by Federico Kereki (Solution Posted, 14 Comments)
Difficulty: 3 of 5Two false coins (in Weights and Scales)
Posted on 2005-03-25 by Federico Kereki (Solution Posted, 11 Comments)
Difficulty: 4 of 5Cosines everywhere (in Geometry) Rating: 4.50
Posted on 2005-03-21 by Federico Kereki (Solution Posted, 6 Comments)
Difficulty: 4 of 5Make it go! (in Science) Rating: 4.50
Posted on 2005-03-18 by Federico Kereki (Solution Posted, 17 Comments)
Difficulty: 3 of 5Knight vs King and Mines (in Games) Rating: 4.00
Posted on 2005-03-07 by Federico Kereki (Solution Posted, 15 Comments)
Difficulty: 4 of 5Boring, boring... (in Geometry) Rating: 4.43
Posted on 2005-03-06 by Federico Kereki (Solution Posted, 13 Comments)
Difficulty: 2 of 5Four four-letter words! (in Word Problems) Rating: 4.00
Posted on 2005-02-27 by Federico Kereki (Solution Posted, 6 Comments)
Difficulty: 4 of 5Opposite synonyms (in Word Problems) Rating: 3.50
Posted on 2005-01-28 by Federico Kereki (Solution Posted, 8 Comments)
Difficulty: 1 of 5A rainbow of haves and have-nots (in Word Problems) Rating: 4.13
Posted on 2005-01-26 by Federico Kereki (Solution Posted, 14 Comments)
Difficulty: 3 of 5All integers (in Geometry) Rating: 4.50
Posted on 2005-01-17 by Federico Kereki (Solution Posted, 14 Comments)
Difficulty: 4 of 5Playing Lotto (in Probability) Rating: 3.75
Posted on 2005-01-14 by Federico Kereki (Solution Posted, 13 Comments)
Difficulty: 3 of 5Two circles (in Geometry) Rating: 3.25
Posted on 2004-10-21 by Federico Kereki (No Solution Yet, 11 Comments)
Difficulty: 2 of 5Sequencing problems (in Numbers) Rating: 3.17
Posted on 2004-10-01 by Federico Kereki (Solution Posted, 8 Comments)
Difficulty: 2 of 53x5 = 5x3 (in Shapes) Rating: 3.08
Posted on 2004-09-30 by Federico Kereki (Solution Posted, 4 Comments)
Difficulty: 3 of 572 degrees (in Weights and Scales) Rating: 3.67
Posted on 2004-09-29 by Federico Kereki (Solution Posted, 9 Comments)
Difficulty: 3 of 57/9 (in Numbers) Rating: 3.83
Posted on 2004-09-27 by Federico Kereki (Solution Posted, 7 Comments)
Difficulty: 2 of 5At the Olympic Games (6) (in Logic) Rating: 2.69
Posted on 2004-09-27 by Federico Kereki (Solution Posted, 47 Comments)
Difficulty: 4 of 5Get one half by squaring (in Just Math) Rating: 4.25
Posted on 2004-09-20 by Federico Kereki (Solution Posted, 31 Comments)
Difficulty: 3 of 5A pool rack filled with balls (in Geometry) Rating: 3.36
Posted on 2004-09-17 by Federico Kereki (Solution Posted, 25 Comments)
Difficulty: 3 of 5Noughts and Crosses (in Games) Rating: 2.75
Posted on 2004-09-16 by Federico Kereki (Solution Posted, 6 Comments)
Difficulty: 1 of 5Mix 'em up! (in Word Problems) Rating: 2.33
Posted on 2004-09-15 by Federico Kereki (Solution Posted, 9 Comments)
Difficulty: 3 of 5Rectangle in lights (in General) Rating: 3.00
Posted on 2004-09-14 by Federico Kereki (Solution Posted, 4 Comments)
Difficulty: 3 of 5Hawks and Doves (in Probability) Rating: 3.50
Posted on 2004-09-13 by Federico Kereki (Solution Posted, 22 Comments)
Difficulty: 2 of 5Harder Russian Roulette (in Probability) Rating: 3.43
Posted on 2004-09-11 by Federico Kereki (Solution Posted, 20 Comments)
Difficulty: 1 of 5Another last digit (in Numbers) Rating: 2.50
Posted on 2004-09-07 by Federico Kereki (Solution Posted, 10 Comments)
Difficulty: 2 of 5Four-letter insert? (in Word Problems) Rating: 2.50
Posted on 2004-09-06 by Federico Kereki (Solution Posted, 10 Comments)
Difficulty: 2 of 5Missing digits (in Just Math) Rating: 2.29
Posted on 2004-09-04 by Federico Kereki (Solution Posted, 9 Comments)
Difficulty: 1 of 5Moo-ing along (in General) Rating: 2.00
Posted on 2004-09-03 by Federico Kereki (Solution Posted, 9 Comments)
Difficulty: 2 of 5Ages (in General) Rating: 3.00
Posted on 2004-08-31 by Federico Kereki (Solution Posted, 10 Comments)
Difficulty: 3 of 5At the Olympic Games (5) (in Logic) Rating: 2.40
Posted on 2004-08-30 by Federico Kereki (Solution Posted, 20 Comments)
Difficulty: 3 of 5Cubeless? (in Just Math) Rating: 3.40
Posted on 2004-08-29 by Federico Kereki (Solution Posted, 7 Comments)
Difficulty: 3 of 5No zeroes allowed (in Numbers) Rating: 3.50
Posted on 2004-08-27 by Federico Kereki (Solution Posted, 4 Comments)
Difficulty: 3 of 58 = 4 + 4 (in Numbers) Rating: 3.00
Posted on 2004-08-26 by Federico Kereki (Solution Posted, 11 Comments)
Difficulty: 3 of 5Nice sum (in Just Math) Rating: 2.75
Posted on 2004-08-24 by Federico Kereki (Solution Posted, 13 Comments)
Difficulty: 4 of 5Provably unprovable? (in Paradoxes) Rating: 3.27
Posted on 2004-08-22 by Federico Kereki (Solution Posted, 36 Comments)
Difficulty: 3 of 5A circle through seven points (in Geometry) Rating: 2.50
Posted on 2004-08-19 by Federico Kereki (Solution Posted, 1 Comments)
Difficulty: 3 of 5Summing inverses (in Calculus) Rating: 4.00
Posted on 2004-08-19 by Federico Kereki (Solution Posted, 18 Comments)
Difficulty: 3 of 5Factorials everywhere (in Just Math) Rating: 2.60
Posted on 2004-08-16 by Federico Kereki (Solution Posted, 6 Comments)
Difficulty: 3 of 5Sides inequality (in Geometry) Rating: 2.33
Posted on 2004-08-13 by Federico Kereki (Solution Posted, 1 Comments)
Difficulty: 4 of 5Sum of two powers (in Just Math) Rating: 4.25
Posted on 2004-08-12 by Federico Kereki (Solution Posted, 7 Comments)
Difficulty: 4 of 5Inverted powers (in Calculus) Rating: 4.00
Posted on 2004-08-10 by Federico Kereki (Solution Posted, 2 Comments)
Difficulty: 3 of 5Waiting, waiting... (in Probability) Rating: 3.29
Posted on 2004-08-07 by Federico Kereki (Solution Posted, 19 Comments)
Difficulty: 3 of 5No colors known? (in Games) Rating: 3.14
Posted on 2004-08-04 by Federico Kereki (Solution Posted, 16 Comments)
Difficulty: 3 of 5Prime clock (in General) Rating: 3.75
Posted on 2004-08-01 by Federico Kereki (Solution Posted, 16 Comments)
Difficulty: 3 of 5Round the square (in Numbers) Rating: 1.00
Posted on 2004-07-30 by Federico Kereki (Solution Posted, 4 Comments)
Difficulty: 3 of 5Maximum sum (in Probability) Rating: 3.60
Posted on 2004-07-29 by Federico Kereki (Solution Posted, 9 Comments)
Difficulty: 4 of 5Just by hand, only by hand, nothing but by hand? (in Algorithms) Rating: 4.17
Posted on 2004-07-26 by Federico Kereki (Solution Posted, 7 Comments)
Difficulty: 3 of 5Before and After (in Sequences) Rating: 4.50
Posted on 2004-07-23 by Federico Kereki (Solution Posted, 4 Comments)
Difficulty: 3 of 5At the Olympic Games (4) (in Logic) Rating: 3.14
Posted on 2004-07-21 by Federico Kereki (Solution Posted, 10 Comments)
Difficulty: 3 of 5Fill in (in Just Math) Rating: 2.71
Posted on 2004-07-20 by Federico Kereki (Solution Posted, 8 Comments)
Difficulty: 1 of 5Who plays next? (in Games) Rating: 2.86
Posted on 2004-07-19 by Federico Kereki (Solution Posted, 13 Comments)
Difficulty: 3 of 5Fibonacci sums (in Just Math) Rating: 3.71
Posted on 2004-07-15 by Federico Kereki (Solution Posted, 13 Comments)
Difficulty: 3 of 5Break a dollar (in Numbers) Rating: 3.33
Posted on 2004-07-14 by Federico Kereki (Solution Posted, 8 Comments)
Difficulty: 3 of 5123456789 equals 100 (in Numbers) Rating: 3.25
Posted on 2004-07-10 by Federico Kereki (Solution Posted, 7 Comments)
Difficulty: 3 of 5Who wins? (in Probability) Rating: 4.00
Posted on 2004-07-08 by Federico Kereki (Solution Posted, 9 Comments)
Difficulty: 3 of 5101 - 102 (in General) Rating: 3.57
Posted on 2004-07-06 by Federico Kereki (Solution Posted, 18 Comments)
Difficulty: 3 of 5How often does he lie? (in Probability) Rating: 2.50
Posted on 2004-07-02 by Federico Kereki (Solution Posted, 6 Comments)
Difficulty: 3 of 5Summing powers (in Just Math) Rating: 3.00
Posted on 2004-07-01 by Federico Kereki (Solution Posted, 18 Comments)
Difficulty: 3 of 5Subsetting a set (in Numbers) Rating: 3.80
Posted on 2004-06-29 by Federico Kereki (Solution Posted, 9 Comments)
Difficulty: 3 of 5Multiplying gets a square? (in Just Math) Rating: 3.00
Posted on 2004-06-26 by Federico Kereki (Solution Posted, 25 Comments)
Difficulty: 3 of 5Magic-in-more-than-one-way Square (in Numbers) Rating: 3.00
Posted on 2004-06-24 by Federico Kereki (Solution Posted, 11 Comments)
Difficulty: 3 of 5More or less magic square (in General) Rating: 3.25
Posted on 2004-06-22 by Federico Kereki (Solution Posted, 11 Comments)
Difficulty: 2 of 5Short equation (in Numbers) Rating: 2.75
Posted on 2004-06-17 by Federico Kereki (Solution Posted, 13 Comments)
Difficulty: 3 of 5Fibonaccian nines (in Just Math) Rating: 4.33
Posted on 2004-06-15 by Federico Kereki (Solution Posted, 7 Comments)
Difficulty: 3 of 5Coin tossing (in Probability) Rating: 3.67
Posted on 2004-06-11 by Federico Kereki (Solution Posted, 25 Comments)
Difficulty: 3 of 5A kiss is just a kiss... (in Numbers) Rating: 3.33
Posted on 2004-06-09 by Federico Kereki (Solution Posted, 4 Comments)
Difficulty: 2 of 5Double C, double T (in Word Problems) Rating: 2.50
Posted on 2004-06-07 by Federico Kereki (Solution Posted, 10 Comments)
Difficulty: 3 of 5Yet one more coin sorting problem (in Weights and Scales) Rating: 4.00
Posted on 2004-05-31 by Federico Kereki (Solution Posted, 20 Comments)
Difficulty: 2 of 5Symmetrical words (in Word Problems) Rating: 3.50
Posted on 2004-05-21 by Federico Kereki (Solution Posted, 17 Comments)
Difficulty: 3 of 5Powers of powers (in Calculus) Rating: 4.10
Posted on 2004-05-11 by Federico Kereki (Solution Posted, 11 Comments)
Difficulty: 3 of 5A dozen Knights (in Shapes) Rating: 3.00
Posted on 2004-05-05 by Federico Kereki (Solution Posted, 5 Comments)
Difficulty: 3 of 5Strange pyramid (in Geometry) Rating: 3.00
Posted on 2004-05-03 by Federico Kereki (Solution Posted, 10 Comments)
Difficulty: 3 of 5Never prime! (in Numbers) Rating: 3.83
Posted on 2004-04-29 by Federico Kereki (Solution Posted, 10 Comments)
Difficulty: 3 of 5Pythagorean Pyramid (in Geometry) Rating: 4.13
Posted on 2004-04-26 by Federico Kereki (Solution Posted, 15 Comments)
Difficulty: 1 of 5I'm a dot in place (in Word Problems) Rating: 3.57
Posted on 2004-04-23 by Federico Kereki (Solution Posted, 12 Comments)
Difficulty: 2 of 5Summing (in Just Math) Rating: 3.80
Posted on 2004-04-16 by Federico Kereki (Solution Posted, 5 Comments)
Difficulty: 2 of 5A flat ball? (in Geometry) Rating: 3.75
Posted on 2004-04-08 by Federico Kereki (Solution Posted, 24 Comments)
Difficulty: 3 of 5At the World Series (in Probability) Rating: 3.20
Posted on 2004-04-01 by Federico Kereki (Solution Posted, 7 Comments)
Difficulty: 3 of 5A point in a square (in Geometry) Rating: 3.13
Posted on 2004-03-17 by Federico Kereki (Solution Posted, 7 Comments)
Difficulty: 3 of 5Diagonal triangle sums (in Just Math) Rating: 3.86
Posted on 2004-03-15 by Federico Kereki (Solution Posted, 4 Comments)
Difficulty: 3 of 5Spirit of '76 (in Just Math) Rating: 4.25
Posted on 2004-03-14 by Federico Kereki (Solution Posted, 8 Comments)
Difficulty: 3 of 5Murder by Logic (in Logic) Rating: 3.67
Posted on 2004-03-05 by Federico Kereki (Solution Posted, 23 Comments)
Difficulty: 3 of 5At the "Oilympic" Games (in Logic) Rating: 3.75
Posted on 2004-03-01 by Federico Kereki (Solution Posted, 16 Comments)
Difficulty: 3 of 5The not-always-lying politician (in General) Rating: 4.00
Posted on 2004-02-27 by Federico Kereki (Solution Posted, 20 Comments)
Difficulty: 3 of 5The Pregnant Secretary (in Algorithms) Rating: 4.00
Posted on 2004-02-21 by Federico Kereki (Solution Posted, 27 Comments)
Difficulty: 4 of 5Three threes, or two twos? (in Just Math) Rating: 4.17
Posted on 2003-12-09 by Federico Kereki (Solution Posted, 3 Comments)
Difficulty: 3 of 5At the Olympic Games (3) (in Logic) Rating: 3.21
Posted on 2003-10-13 by Federico Kereki (Solution Posted, 14 Comments)
Difficulty: 3 of 5At the Olympic Games (2) (in Logic) Rating: 3.00
Posted on 2003-10-09 by Federico Kereki (Solution Posted, 7 Comments)
Difficulty: 3 of 5At the Olympic Games (1) (in Logic) Rating: 3.11
Posted on 2003-10-07 by Federico Kereki (Solution Posted, 20 Comments)
Difficulty: 2 of 5A Logic Accusation (in Logic) Rating: 2.87
Posted on 2003-10-01 by Federico Kereki (Solution Posted, 17 Comments)
Difficulty: 3 of 5Cut chessboard (in Shapes) Rating: 4.00
Posted on 2003-09-26 by Federico Kereki (Solution Posted, 6 Comments)
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