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> Logic> Probability (1)> Shapes (1)> General
> Numbers (1)> Games> Paradoxes> Riddles
> Just Math> Science> Algorithms
For a positive integer x drawn at random between 1 and 20000 inclusively, determine the probability that (x!+1)/(x+1) is a prime number.

(No Solution Yet, 5 Comments) Submitted on 2010-07-30 by K Sengupta   
Difficulty: 3 of 5 Bonus: Umpteenth Hobbit Riddle (in Famous Riddles) Rating: 2.39
A box without hinges, key, or lid,

Yet golden treasure inside is hid.

(Solution Posted, 40 Comments) Submitted on 2003-06-17 by Ravi Raja   
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Posted on 2010-07-29 by Charlie (No Solution Yet, 3 Comments)
Difficulty: 3 of 5Tangent Trapezoid (in Geometry)
Posted on 2010-07-28 by Bractals (Solution Posted, 1 Comments)
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Posted on 2010-07-27 by K Sengupta (No Solution Yet, 2 Comments)
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Posted on 2010-07-26 by K Sengupta (No Solution Yet, 7 Comments)
Difficulty: 3 of 5Sum Celebrity Concerns (in Numbers)
Posted on 2010-07-25 by K Sengupta (No Solution Yet, 3 Comments)
Difficulty: 3 of 5Bicentric Trapezoids (in Geometry) Rating: 3.00
Posted on 2010-07-24 by Brian Smith (No Solution Yet, 1 Comments)
Difficulty: 3 of 5Quadrilateral Equals Overlapping Triangles (in Geometry)
Posted on 2010-07-23 by Bractals (Solution Posted, 1 Comments)
Difficulty: 4 of 5POWER CHAIN. (in Sequences)
Posted on 2010-07-22 by Ady TZIDON (No Solution Yet, 6 Comments)
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Posted on 2010-07-21 by Ady TZIDON (No Solution Yet, 5 Comments)
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Posted on 2010-07-20 by K Sengupta (No Solution Yet, 2 Comments)
Difficulty: 3 of 5Three Lock Box (in Geometry)
Posted on 2010-07-19 by Larry (No Solution Yet, 4 Comments)
Difficulty: 3 of 5Inscribe Right Triangle (in Geometry)
Posted on 2010-07-18 by Bractals (Solution Posted, 1 Comments)

Recently Posted Solutions:
Difficulty: 3 of 5Tangent Trapezoid (in Geometry)
Submitted By Bractals. Solution posted on 2010-07-28 17:51:46
Difficulty: 3 of 5Quadrilateral Equals Overlapping Triangles (in Geometry)
Submitted By Bractals. Solution posted on 2010-07-27 18:24:13
Difficulty: 3 of 5Inscribe Right Triangle (in Geometry)
Submitted By Bractals. Solution posted on 2010-07-26 14:21:27
Difficulty: 3 of 5Chain Gang- a contest and a game (in Word Problems)
Submitted By Ady TZIDON. Solution posted on 2010-07-16 07:11:15
Difficulty: 3 of 5Using 128 digits (in Cryptography)
Submitted By Ady TZIDON. Solution posted on 2010-07-16 07:04:18
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