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 Home Welcome to perplexus.info, flooble's perplexing puzzle portal. Here, we collect all sorts of puzzles, from simple logic questions and word tricks to in-depth math problems like probability and geometry. Click around and see if your brain is up to the task! If you're new here, make sure you sign up so that you can leave comments and submit your own problems!
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Given the number 188188...188 (number 188 is written 101 times). Some digits of this number are crossed out. What is the largest multiple of 7, that could happen?
 (No Solution Yet, 3 Comments) Submitted on 2021-04-21 by Danish Ahmed Khan
Bonus: Close to Fermat (in Numbers)
Show that if an+bn= 2m, and a, b, m, and n are positive integers (n>1), then a=b.
 (Solution Posted, 4 Comments) Submitted on 2007-04-06 by Federico Kereki
Common and tasty (in Word Problems) Rating: 5.00
Find set cardinality (in Just Math)
Posted on 2021-04-19 by Danish Ahmed Khan (No Solution Yet, 2 Comments)
Pigeonhole roots (in Just Math)
Posted on 2021-04-16 by Danish Ahmed Khan (No Solution Yet, 2 Comments)
Bouncing Bishops (in General)
Posted on 2021-04-15 by Charlie (No Solution Yet, 1 Comments)
Prisoners and Coins (in Logic) Rating: 3.00
Posted on 2021-04-14 by tomarken (No Solution Yet, 4 Comments)
Time to rhyme (in Numbers) Rating: 3.00
Of equal area (in Geometry)
Constrained circle in quadrilateral (in Just Math)
Posted on 2021-04-09 by Danish Ahmed Khan (No Solution Yet, 2 Comments)
Euphony (in Logic) Rating: 3.00
Pandigital powers (in Numbers) Rating: 5.00
Posted on 2021-04-07 by Math Man (No Solution Yet, 5 Comments)
Posted on 2021-04-06 by Larry (Solution Posted, 3 Comments)
Nearsighted rooks on a large chessboard (in Just Math) Rating: 3.00
Posted on 2021-04-05 by Danish Ahmed Khan (No Solution Yet, 4 Comments)
Posted on 2021-04-02 by Danish Ahmed Khan (No Solution Yet, 2 Comments)
Knight tour in an infinite board (in Just Math)
Posted on 2021-04-01 by Danish Ahmed Khan (No Solution Yet, 2 Comments)

Recently Posted Solutions:
Submitted By Larry. Solution posted on 2021-04-06 18:17:40
Square Deal (in Word Problems)
Submitted By Charlie. Solution posted on 2021-04-01 10:25:06
Beat The Book (in Probability)
Submitted By tomarken. Solution posted on 2021-03-19 07:43:33
Complex Roots Magnitude (in Just Math)
Submitted By Brian Smith. Solution posted on 2021-03-04 23:19:09
The class of ‘55’ (in Numbers)
Submitted By Ady TZIDON. Solution posted on 2021-02-28 01:55:58

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