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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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Difficulty: 3 of 5 Latest: 7s and 8s (in Numbers)
Find a 13 digit positive integer N whose base ten representation consists entirely of 7s and 8s such that 313 divides N.
(No Solution Yet, 1 Comments) Submitted on 2024-11-20 by K Sengupta   
Difficulty: 3 of 5 Bonus: A square squared (in Shapes) Rating: 4.60
A four-dimensional hypercube has vertices connecting 4 edges, each edge 90 degrees apart from each other. Each edge is 1 unit long. Find the 3-d surface volume of this cube. Find the 2-d surface area. Find the sum of the lengths of all the edges.

Find a general equation for the s-dimensional surface area of an c-dimensional cube with one unit side length. For example, if s=1 and c=3, you're finding the sum of the length of the edges of a normal cube.

(Solution Posted, 5 Comments) Submitted on 2004-03-20 by Tristan   
Difficulty: 3 of 5divisibility by 37 (in Numbers)
Posted on 2024-11-20 by Danish Ahmed Khan (No Solution Yet, 1 Comments)
Difficulty: 3 of 5King-Queen-Jack (in General)
Posted on 2024-11-19 by K Sengupta (No Solution Yet, 0 Comments)
Difficulty: 3 of 5Perfectly divisible (in Numbers)
Posted on 2024-11-19 by Danish Ahmed Khan (No Solution Yet, 1 Comments)
Difficulty: 3 of 5Largest Number of Positive Integers (in Numbers)
Posted on 2024-11-18 by K Sengupta (No Solution Yet, 1 Comments)
Difficulty: 3 of 5System Solution Sum (in Just Math) Rating: 5.00
Posted on 2024-11-18 by Danish Ahmed Khan (No Solution Yet, 3 Comments)
Difficulty: 2 of 5A reducible expression (in Just Math)
Posted on 2024-11-17 by Danish Ahmed Khan (No Solution Yet, 3 Comments)
Difficulty: 1 of 5Determine the Last Digit (in Numbers) Rating: 5.00
Posted on 2024-11-17 by K Sengupta (No Solution Yet, 2 Comments)
Difficulty: 3 of 5Function Challenge #2 (in Just Math)
Posted on 2024-11-16 by K Sengupta (No Solution Yet, 1 Comments)
Difficulty: 3 of 5Triangle Trilateration (in General)
Posted on 2024-11-16 by Danish Ahmed Khan (No Solution Yet, 2 Comments)
Difficulty: 3 of 5Complex sequence (in Just Math)
Posted on 2024-11-15 by Danish Ahmed Khan (No Solution Yet, 1 Comments)
Difficulty: 2 of 5Little power sum (in Numbers)
Posted on 2024-11-15 by Danish Ahmed Khan (No Solution Yet, 4 Comments)
Difficulty: 3 of 5Irrational or Rational (in Just Math)
Posted on 2024-11-14 by K Sengupta (Solution Posted, 1 Comments)
Difficulty: 3 of 5Fraction^Fraction (in Just Math)
Posted on 2024-11-14 by K Sengupta (No Solution Yet, 0 Comments)
Difficulty: 3 of 5Knight Moves Function (in Games)
Posted on 2024-11-13 by Larry (No Solution Yet, 2 Comments)

Recently Posted Solutions:
Difficulty: 3 of 5Irrational or Rational (in Just Math)
Submitted By K Sengupta. Solution posted on 2024-11-15 23:24:37
Difficulty: 3 of 5An interesting recurrence (in Numbers)
Submitted By Math Man. Solution posted on 2024-10-29 08:59:26
Difficulty: 3 of 5Catch the catch phrase (in Word Problems)
Submitted By Ady TZIDON. Solution posted on 2024-10-09 20:59:03
Difficulty: 3 of 5Counting Sextuplets (in Just Math)
Submitted By K Sengupta. Solution posted on 2024-10-06 05:22:59
Difficulty: 2 of 5Queen and the Chair (in Riddles)
Submitted By K Sengupta. Solution posted on 2024-09-14 01:40:02
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