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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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> Just Math> Science> Algorithms
Difficulty: 3 of 5 Latest: Got a hint? (in Sequences) Rating: 4.00

3 8 7 9 1 6 4 1 5
2 1 6 3 8 7 3 6 6
5 9 4 2 4 5 2 8 7
4 6 7 1 4 9 8 2 3
9 2 1 7 5 2 1 7 8
8 7 3 1 3 9 6 8 3
6 9 4 5 6 7 2 7 1
5 1 8 7 2 3 1 6 3
3 7 2 6 1 2 8 2 5

The above 9*9 matrix was not generated randomly.
There was some principle in its creation - for you to discover.

So what is it??

(No Solution Yet, 4 Comments) Submitted on 2020-02-17 by Ady TZIDON   
Difficulty: 3 of 5 Bonus: Hat Exchange (in Algorithms) Rating: 3.00
At a party with N people, each person is identified by a unique number between 1 and N. Each person is also wearing a hat with their number on it. They decide to play a game. Each person passes his or her hat to the person with the next highest number (so person 2 gets hat 1, person 3 gets hat 2, and person 1 gets hat N). The game proceeds from there in rounds; on each round, each person may choose to either keep the hat they currently have, or swap hats with exactly one other person.

What is the minimum number of rounds, as a function of N, that it would take for every person to get their own hat back? Note: each person can see their own hat at any time.

(Solution Posted, 8 Comments) Submitted on 2005-02-24 by Avin   
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Posted on 2020-02-14 by JLo (No Solution Yet, 4 Comments)
Difficulty: 4 of 5pot draw permutations (in Numbers)
Posted on 2020-02-12 by Steven Lord (No Solution Yet, 2 Comments)
Difficulty: 2 of 5PYHIYP #4 (in Logic)
Posted on 2020-02-10 by Ady TZIDON (No Solution Yet, 1 Comments)
Difficulty: 2 of 5PYHIYP #3: 8 given, 1 missing (in Logic)
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Difficulty: 2 of 5Pythagorean Reciprocals (in Geometry)
Posted on 2020-02-05 by Brian Smith (No Solution Yet, 1 Comments)
Difficulty: 2 of 513 T2Ts (in Word Problems) Rating: 5.00
Posted on 2020-02-03 by Steven Lord (Solution Posted, 18 Comments)
Difficulty: 4 of 5The Smashing Pumpkins (in General)
Posted on 2020-01-31 by JLo (No Solution Yet, 1 Comments)
Difficulty: 3 of 5Insert A B & C (in Word Problems)
Posted on 2020-01-29 by Ady TZIDON (No Solution Yet, 1 Comments)
Difficulty: 3 of 5Skyscrapers 2 (in Logic)
Posted on 2020-01-27 by Charlie (Solution Posted, 4 Comments)
Difficulty: 3 of 5Reflection Triangle (in Shapes)
Posted on 2020-01-24 by Danish Ahmed Khan (No Solution Yet, 5 Comments)
Difficulty: 3 of 5Certain old trade (in General)
Posted on 2020-01-22 by Ady TZIDON (No Solution Yet, 5 Comments)
Difficulty: 2 of 5Set-Free (in Logic) Rating: 2.00
Posted on 2020-01-20 by Charlie (Solution Posted, 1 Comments)
Difficulty: 4 of 5Quadrootles (in Numbers)
Posted on 2020-01-17 by JLo (Solution Posted, 2 Comments)
Difficulty: 2 of 5Find the Holes (in Logic)
Posted on 2020-01-15 by Charlie (Solution Posted, 1 Comments)

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