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Difficulty: 2 of 5Under The reversed numbers (in Just Math)
Posted on 2005-09-16 (7 Comments)
Second Solution by np_rt (2005-09-16 19:28:01)
Difficulty: 3 of 5Under A classic game (in Numbers)
Posted on 2005-06-22 (9 Comments)
Solution by Hand by np_rt (2005-06-22 20:19:22)
Difficulty: 4 of 5Under Just find two! (in Geometry)
Posted on 2005-04-27 (25 Comments)
Iterative Method by np_rt (2005-04-27 22:40:14)
Difficulty: 3 of 5Under Unequally Unintegrally Yoked (in Calculus)
Posted on 2005-04-24 (8 Comments)
re(2): Solution & Spoiler by np_rt (2005-04-25 03:33:39)
Difficulty: 3 of 5Under Ice Floating in Water (in Science)
Posted on 2005-04-21 (31 Comments)
Bottom Line by np_rt (2005-04-22 07:21:43)
re: Uncertainty - continue by np_rt (2005-04-21 17:44:10)
re: Uncertainty by np_rt (2005-04-21 16:18:14)
Difficulty: 2 of 5Under Billy's bag (in Probability)
Posted on 2005-04-17 (18 Comments)
re(2): Solution by np_rt (2005-04-17 17:17:14)
Solution by np_rt (2005-04-17 16:44:44)
Difficulty: 3 of 5Under Balls of confusion (in Science)
Posted on 2005-04-05 (11 Comments)
re: Another guess (solution?) by np_rt (2005-04-06 02:07:38)
Difficulty: 3 of 5Under Hollow ball (in Science)
Posted on 2005-03-25 (26 Comments)
re: solution by np_rt (2005-03-31 20:26:11)
re: correction by np_rt (2005-03-26 18:31:21)
One Possible Method and Proof Why it Works by np_rt (2005-03-25 15:57:13)
Difficulty: 3 of 5Under Fateful Fickle Fifteen (in Probability)
Posted on 2005-03-24 (8 Comments)
re: faulty (suggestions) by np_rt (2005-03-24 15:54:20)
Difficulty: 3 of 5Under Lowest & Highest (in Sequences)
Posted on 2005-02-24 (11 Comments)
Hint by np_rt (2005-02-24 23:51:41)
Difficulty: 2 of 5Under Proving a witch weighs the same as a duck (in Tricks)
Posted on 2005-02-21 (12 Comments)
Solution by np_rt (2005-02-21 16:25:08)
Difficulty: 5 of 5Under Figure Eights (in General)
Posted on 2005-02-15 (34 Comments)
This may work! by np_rt (2005-02-16 08:38:55)
Difficulty: 2 of 5Under Difference of Cubes OF DOOM (in Just Math)
Posted on 2005-02-11 (8 Comments)
Simpler Method by np_rt (2005-02-12 18:20:57)
Difficulty: 3 of 5Under Who stole the candy bar? (in Liars and Knights)
Posted on 2005-02-03 (25 Comments)
Solution by np_rt (2005-02-03 18:49:46)
Difficulty: 3 of 5Under Relativistic Bullet - perpendicular (in Science)
Posted on 2005-01-17 (15 Comments)
Thought by np_rt (2005-01-18 01:03:13)
Difficulty: 3 of 5Under All integers (in Geometry)
Posted on 2005-01-17 (14 Comments)
re(2): Solution (Proof by Hand) Corrected by np_rt (2005-01-18 00:53:18)
Solution (Proof by Hand) by np_rt (2005-01-17 20:37:24)
Difficulty: 3 of 5Under Square pairs (in Numbers)
Posted on 2005-01-09 (12 Comments)
Non-Computer-Aided Solution by np_rt (2005-01-09 20:16:43)
re: beginning by np_rt (2005-01-09 18:00:39)
Difficulty: 3 of 5Under Math Class (in Numbers)
Posted on 2004-12-23 (9 Comments)
Clarification Required by np_rt (2004-12-23 19:48:38)
Difficulty: 2 of 5Under Summations (in Just Math)
Posted on 2004-12-18 (7 Comments)
Hmm.... by np_rt (2004-12-18 16:26:55)
Difficulty: 4 of 5Under Wrong Division (in Just Math)
Posted on 2004-12-03 (8 Comments)
Final Solution by np_rt (2004-12-03 19:18:57)
re: One More (Slightly Better) by np_rt (2004-12-03 18:43:23)
One More by np_rt (2004-12-03 18:37:10)
Another observation by np_rt (2004-12-03 18:30:55)
First Steps by np_rt (2004-12-03 17:54:26)
Difficulty: 3 of 5Under Center Digits (in Numbers)
Posted on 2004-11-28 (15 Comments)
re(4): Excel Solution by np_rt (2004-11-29 07:36:51)
re(2): Excel Solution by np_rt (2004-11-28 18:35:05)
Difficulty: 4 of 5Under Exponential Difficulties 2 (in Just Math)
Posted on 2004-11-27 (9 Comments)
Solution by np_rt (2004-11-27 18:43:38)
Difficulty: 5 of 5Under Moon Experiment (in Science)
Posted on 2004-11-22 (22 Comments)
No Subject by np_rt (2004-11-23 19:46:10)
re: part 1: another method; another answer (wrong assumption) by np_rt (2004-11-22 23:24:06)
Completely Analytical Solution (Physics + Differential Calculus) by np_rt (2004-11-22 19:35:07)
Difficulty: 3 of 5Under Triangle Circle (in Geometry)
Posted on 2004-11-20 (8 Comments)
re(2): Solution (correction) by np_rt (2004-11-20 19:41:22)
Solution by np_rt (2004-11-20 18:34:17)
Difficulty: 2 of 5Under Tango (in Sequences)
Posted on 2004-11-11 (10 Comments)
re: Hints and spoilers by np_rt (2004-11-11 11:07:01)
Difficulty: 3 of 5Under Ordering Pairs (in Numbers)
Posted on 2004-11-06 (10 Comments)
First Steps by np_rt (2004-11-06 13:17:27)
Difficulty: 2 of 5Under Prime Time Revisited (in Just Math)
Posted on 2004-10-22 (17 Comments)
Brute Force Solution by np_rt (2004-10-22 16:53:07)
Difficulty: 2 of 5Under The Sum of the Parts Is Less Than And More Than the Parts (in Numbers)
Posted on 2004-10-15 (11 Comments)
Proof by np_rt (2004-10-15 18:09:50)
Difficulty: 3 of 5Under Candy Box (in Numbers)
Posted on 2004-10-08 (17 Comments)
re(3): About 9 pieces (my bad) by np_rt (2004-10-09 17:20:58)
re: About 9 pieces by np_rt (2004-10-08 18:59:03)
Difficulty: 3 of 5Under Summing Squares Sequentially! (in Numbers)
Posted on 2004-10-01 (10 Comments)
Correct Solution by np_rt (2004-10-03 10:49:21)
re(4): Solution (need more work) by np_rt (2004-10-02 10:38:36)
re(2): Solution (slight correction) by np_rt (2004-10-01 15:35:04)
Solution by np_rt (2004-10-01 14:15:05)
Difficulty: 4 of 5Under Get one half by squaring (in Just Math)
Posted on 2004-09-20 (31 Comments)
re(2): Solution by np_rt (2004-09-21 10:27:16)
Solution by np_rt (2004-09-20 21:37:43)
Difficulty: 3 of 5Under A pool rack filled with balls (in Geometry)
Posted on 2004-09-17 (25 Comments)
Mathematical Solution (exact answer) by np_rt (2004-09-17 21:33:55)
Difficulty: 1 of 5Under Gonna party like it's 1999 (in Just Math)
Posted on 2004-09-12 (7 Comments)
re: Answer by np_rt (2004-09-12 13:14:22)
Difficulty: 2 of 5Under Harder Russian Roulette (in Probability)
Posted on 2004-09-11 (20 Comments)
Simple Counting Would Work by np_rt (2004-09-11 14:26:58)
Difficulty: 4 of 5Under Hole in a bead (in Calculus)
Posted on 2004-08-21 (13 Comments)
re: ??? by np_rt (2004-08-21 10:37:53)
Difficulty: 3 of 5Under Summing inverses (in Calculus)
Posted on 2004-08-19 (18 Comments)
re(2): Reason why sum of limits is not same as limit as sums by np_rt (2004-08-20 01:57:45)
Reason why sum of limits is not same as limit as sums by np_rt (2004-08-19 15:25:22)
Difficulty: 3 of 5Under Sides inequality (in Geometry)
Posted on 2004-08-13 (1 Comments)
No Subject by np_rt (2004-08-13 15:34:15)
Difficulty: 4 of 5Under Inverted powers (in Calculus)
Posted on 2004-08-10 (2 Comments)
Proof by np_rt (2004-08-10 14:07:56)
Difficulty: 3 of 5Under 10,000 (in Numbers)
Posted on 2004-07-21 (10 Comments)
All 10 Solutions Analytically by np_rt (2004-07-21 16:41:48)
Difficulty: 4 of 5Under A Point and a Cube (in Geometry)
Posted on 2004-07-16 (23 Comments)
PD can't be 9. Correct Restrictions on PD. by np_rt (2004-07-18 18:35:48)
Grrr... by np_rt (2004-07-17 17:40:50)
Difficulty: 2 of 5Under Yet Another 0=1 (in Calculus)
Posted on 2004-07-08 (10 Comments)
re(2): Solution by np_rt (2004-07-08 20:47:41)
Solution by np_rt (2004-07-08 16:11:44)
Difficulty: 3 of 5Under Summing powers (in Just Math)
Posted on 2004-07-01 (18 Comments)
re: Solution (calculation error) by np_rt (2004-07-01 15:11:10)
Solution by np_rt (2004-07-01 13:35:33)
Difficulty: 2 of 5Under Gloves (in Numbers)
Posted on 2004-06-03 (30 Comments)
re(3): Different solution? by np_rt (2004-06-04 12:12:27)
re: Different solution? by np_rt (2004-06-03 14:56:40)
Difficulty: 2 of 5Under Linked Rings (in Geometry)
Posted on 2004-05-29 (19 Comments)
My Guess by np_rt (2004-05-29 11:17:01)
Difficulty: 2 of 5Under The Monkey Tail Hunter (in Science)
Posted on 2004-05-28 (15 Comments)
Solution and Proof by np_rt (2004-05-30 09:04:00)
Difficulty: 2 of 5Under The Knavy (in Liars and Knights)
Posted on 2004-05-27 (21 Comments)
Solution by np_rt (2004-05-27 13:07:33)
Difficulty: 5 of 5Under Ellipses (in Geometry)
Posted on 2004-05-17 (12 Comments)
re: Part 1 by np_rt (2004-05-18 00:27:15)
Difficulty: 3 of 5Under 3x3 sums (in Numbers)
Posted on 2004-05-15 (11 Comments)
Good ole elimination by np_rt (2004-05-16 03:22:48)
Difficulty: 3 of 5Under Powers of powers (in Calculus)
Posted on 2004-05-11 (11 Comments)
Numerical Solution by np_rt (2004-05-11 13:43:09)
Difficulty: 2 of 5Under Particle Acceleration (in General)
Posted on 2004-05-06 (24 Comments)
Starter by np_rt (2004-05-09 12:36:57)
re: My uninfluenced solution by np_rt (2004-05-09 12:20:32)
Difficulty: 4 of 5Under Chords and Chords (in Geometry)
Posted on 2004-03-24 (23 Comments)
re: Too Simplistic? by np_rt (2004-07-10 21:37:43)
Difficulty: 3 of 5Under A point in a square (in Geometry)
Posted on 2004-03-17 (7 Comments)
Solution (Excel-Aided) by np_rt (2004-03-17 22:19:04)
Difficulty: 4 of 5Under Like Clockwork (in Geometry)
Posted on 2004-02-27 (29 Comments)
re: Answer (Mistake again) by np_rt (2004-02-28 01:05:50)
Answer by np_rt (2004-02-28 01:00:09)
re: Analytic Solution (with no errors I hope) found an error already by np_rt (2004-02-28 00:48:28)
Analytic Solution (with no errors I hope) by np_rt (2004-02-28 00:45:57)
Difficulty: 3 of 5Under Lines on the Curve (in Geometry)
Posted on 2004-02-23 (4 Comments)
re(2): Complete Solution - My Mistake by np_rt (2004-02-24 12:41:04)
Complete Solution by np_rt (2004-02-24 04:59:38)
Difficulty: 2 of 5Under Time Please (in Just Math)
Posted on 2004-01-12 (8 Comments)
Full Solution by np_rt (2004-01-12 10:36:01)
Difficulty: 3 of 5Under Circle in hypotenuse (in Geometry)
Posted on 2003-11-14 (13 Comments)
Solution without Analytic Geometry by np_rt (2003-11-19 13:08:47)
Difficulty: 4 of 5Under Strike a Chord (..Any Chord) (in Geometry)
Posted on 2003-10-09 (51 Comments)
Solution (I Think) by np_rt (2003-10-09 15:00:05)
Difficulty: 3 of 5Under Life or Death (in Logic)
Posted on 2003-06-29 (32 Comments)
re: absurdity (why are you so absurd, Dan?) by np_rt (2005-03-27 18:53:15)
Difficulty: 3 of 5Under Cool it fast... (in Science)
Posted on 2003-04-01 (20 Comments)
Inaccurate solution by np_rt (2003-04-14 10:24:53)
Difficulty: 2 of 5Under Solids are denser? (in Science)
Posted on 2003-03-23 (17 Comments)
Answer by np_rt (2003-03-24 08:19:34)
Difficulty: 2 of 5Under 2,000,000 Coin Tosses (in Probability)
Posted on 2003-03-03 (10 Comments)
non-numerical solution by np_rt (2003-03-03 07:57:51)
Difficulty: 2 of 5Under Too Old For Grandma (in Numbers)
Posted on 2003-02-28 (16 Comments)
Answer by np_rt (2003-02-28 08:37:24)
Difficulty: 3 of 5Under pH of water again (in Science)
Posted on 2003-02-15 (8 Comments)
Hints/Tips Hint by np_rt (2003-02-15 18:25:41)
Difficulty: 3 of 5Under How Many Children ? (in Logic)
Posted on 2003-01-28 (13 Comments)
Agree by np_rt (2003-01-28 14:21:05)
Difficulty: 2 of 5Under Passing through zero (in Science)
Posted on 2003-01-19 (15 Comments)
Mass and Time by np_rt (2003-01-19 08:22:37)
Difficulty: 2 of 5Under The 3 cans (in Logic)
Posted on 2003-01-18 (12 Comments)
re: 3cans guess by np_rt (2003-01-18 18:48:44)
Some Thoughts My Guess by np_rt (2003-01-18 06:53:00)
Difficulty: 2 of 5Under Two men and the mountains (in Riddles)
Posted on 2003-01-16 (36 Comments)
Something Similar by np_rt (2003-01-16 14:41:33)
Simple by np_rt (2003-01-16 14:37:17)
Difficulty: 3 of 5Under Which Game? (in Logic)
Posted on 2002-12-31 (18 Comments)
Elimination by np_rt (2003-01-01 00:46:13)
My Own Solution by np_rt (2003-01-01 00:28:31)
re: My solution by np_rt (2003-01-01 00:24:28)
Difficulty: 2 of 5Under Two Barbers (in Logic)
Posted on 2002-12-27 (21 Comments)
My Guess by np_rt (2002-12-27 21:18:36)
Difficulty: 5 of 5Under The Punched-Out Numeral (in Logic)
Posted on 2002-12-27 (10 Comments)
re: Popping Balloons (see note at end) by np_rt (2002-12-27 21:37:48)
Difficulty: 2 of 5Under Sugar Cubes (in Shapes)
Posted on 2002-12-24 (10 Comments)
re: As easy as 1,2,4 (corrections) by np_rt (2002-12-24 23:58:32)
Difficulty: 2 of 5Under Enough Rope to Shoot Yourself in the Foot (in Calculus)
Posted on 2002-12-22 (12 Comments)
re: solution by np_rt (2002-12-25 19:02:05)
Solution by np_rt (2002-12-24 23:41:13)
Difficulty: 2 of 5Under Lockers (in Numbers)
Posted on 2002-12-06 (10 Comments)
Solution Plus Assumption by np_rt (2002-12-07 14:04:59)
Difficulty: 4 of 5Under Forensic Fancy (in Science)
Posted on 2002-08-20 (14 Comments)
A bit late but... by np_rt (2003-01-12 00:03:44)
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