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Difficulty: 3 of 5 Latest: Prove or disprove (in Numbers)
There are 20 students, each has a choice of anywhere from 0 to 6 courses from a total of 6 courses offered.

Prove or disprove:
There are 5 students and 2 certain courses such that all 5 have chosen both courses or all 5 have chosen neither of them.

(No Solution Yet, 0 Comments) Submitted on 2016-02-11 by Ady TZIDON   
Difficulty: 4 of 5 Bonus: Magic Rods (in Logic) Rating: 4.00
You need to make a set of five rods for a magic trick, with numbers on them ranging from 1 to 31 inclusive. Then you ask people to pick a number and show you only the top number of whatever rods it is on. From that you have to guess which number the person picked. This has to be done within a few seconds and isn't a matter of remembering what numbers are on them.

What numbers should be on each of the five rods?

(Solution Posted, 13 Comments) Submitted on 2003-11-11 by Lewis   
Difficulty: 2 of 5Boxes galore (in Numbers)
Posted on 2016-02-11 by Ady TZIDON (No Solution Yet, 2 Comments)
Difficulty: 4 of 5Optimal Order (in Sequences)
Posted on 2016-02-10 by broll (No Solution Yet, 1 Comments)
Difficulty: 2 of 5How high the moon tonight (in Numbers)
Posted on 2016-02-10 by Ady TZIDON (No Solution Yet, 1 Comments)
Difficulty: 3 of 5Consecutive Numbers and Subset Choice (in Just Math) Rating: 3.00
Posted on 2016-02-09 by K Sengupta (No Solution Yet, 6 Comments)
Difficulty: 2 of 5Two Square Settlement (in Shapes)
Posted on 2016-02-09 by K Sengupta (No Solution Yet, 1 Comments)
Difficulty: 3 of 5Three in a row (in Numbers) Rating: 2.50
Posted on 2016-02-08 by Ady TZIDON (No Solution Yet, 3 Comments)
Difficulty: 2 of 5Interesting representation (in Numbers)
Posted on 2016-02-08 by Ady TZIDON (No Solution Yet, 3 Comments)
Difficulty: 3 of 5Coefficient From Roots (in Just Math)
Posted on 2016-02-07 by K Sengupta (No Solution Yet, 2 Comments)
Difficulty: 3 of 5Power Expressions and Division (in Just Math)
Posted on 2016-02-06 by K Sengupta (No Solution Yet, 1 Comments)
Difficulty: 4 of 5Pumpkins 7 (in Just Math) Rating: 4.00
Posted on 2016-02-05 by Brian Smith (Solution Posted, 2 Comments)
Difficulty: 2 of 5Fifty-fifty (in Just Math) Rating: 3.00
Posted on 2016-02-05 by Ady TZIDON (No Solution Yet, 2 Comments)
Difficulty: 3 of 5a version of NIM (in Games) Rating: 3.00
Posted on 2016-02-04 by Ady TZIDON (No Solution Yet, 3 Comments)
Difficulty: 1 of 5Word Grid (in Word Problems)
Posted on 2016-02-04 by Charlie (No Solution Yet, 6 Comments)
Difficulty: 3 of 5Square in Pascal's triangle (in Just Math)
Posted on 2016-02-03 by Ady TZIDON (No Solution Yet, 0 Comments)

Recently Posted Solutions:
Difficulty: 4 of 5Pumpkins 7 (in Just Math)
Submitted By Brian Smith. Solution posted on 2016-02-06 11:17:25
Difficulty: 3 of 5One of Sixteen (in Weights and Scales)
Submitted By Brian Smith. Solution posted on 2016-02-04 12:40:38
Difficulty: 4 of 5Pumpkins 6 (in Numbers)
Submitted By Brian Smith. Solution posted on 2016-02-03 11:12:30
Difficulty: 1 of 5Three Block Quickie (in Weights and Scales)
Submitted By Brian Smith. Solution posted on 2016-01-30 10:43:15
Difficulty: 3 of 5A Math Problem (in Just Math)
Submitted By broll. Solution posted on 2016-01-30 00:18:55
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