perplexus.info :: logic puzzles, brainteasers, riddles and math tricks

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!

Categories (All Problem Categories)

> Logic	> Probability	> Shapes	> General
> Numbers (2)	> Games	> Paradoxes	> Riddles
> Just Math (1)	> Science	> Algorithms

Latest: Partridge Pandigital Set (in Numbers)

Find the smallest set of distinct whole numbers that contains one 1, two 2s, three 3s, ..., nine 9s

Smallest refers to the sum of the numbers in the set.

(No Solution Yet, 1 Comments)

Submitted on 2009-07-05 by Jer

Bonus: Unknown Digits (in Numbers) Rating: 3.67

In this cryptarithm, each letter above the line represents a digit differing by 1 from the digit represented by the same letter below the line. For example, if A=3 above the line, then A=2 or A=4 below the line. All occurrences of a letter on the same side of a line represent the same digit. It is also known that there are total of five digits in the solution.

 ADABA
+CACBA
------
 DBABC

(Solution Posted, 8 Comments)

Submitted on 2004-08-11 by Brian Smith

Going Cyclic With Geometric II (in Numbers)
Posted on 2009-07-04 by K Sengupta (No Solution Yet, 4 Comments)

Digits 1 to B (in Just Math) Rating: 2.00
Posted on 2009-07-03 by K Sengupta (No Solution Yet, 1 Comments)

An empty problem (in Riddles) Rating: 1.00
Posted on 2009-07-02 by Daniel (No Solution Yet, 3 Comments)

Fly on a cone (in Just Math)
Posted on 2009-07-01 by Bractals (Solution Posted, 1 Comments)

3/9, 12/9 and 1/2 (in Numbers)
Posted on 2009-06-30 by Dej Mar (No Solution Yet, 1 Comments)

How much time will you spend? (in Tricks)
Posted on 2009-06-29 by pcbouhid (Solution Posted, 3 Comments)

Eight-Digit Numbers In Reverse (in Just Math) Rating: 2.50
Posted on 2009-06-28 by K Sengupta (No Solution Yet, 3 Comments)

Pandigital Processed Primes (in Numbers)
Posted on 2009-06-27 by Charlie (Solution Posted, 1 Comments)

Terminating in seven sevens (in Numbers)
Posted on 2009-06-26 by K Sengupta (No Solution Yet, 2 Comments)

3x3 Nim (in Games) Rating: 4.20
Posted on 2009-06-25 by Jer (Solution Posted, 24 Comments)

Subtract 1, get a square (in Just Math)
Posted on 2009-06-24 by K Sengupta (No Solution Yet, 4 Comments)

Bounded Sine (in Shapes)
Posted on 2009-06-23 by Jer (No Solution Yet, 2 Comments)

Multiply Sum and Sum of Squares (in Numbers)
Posted on 2009-06-22 by K Sengupta (No Solution Yet, 4 Comments)

Duality (in Cryptography)
Posted on 2009-06-21 by brianjn (No Solution Yet, 2 Comments)

Recently Posted Solutions:

How much time will you spend? (in Tricks)
Submitted By pcbouhid. Solution posted on 2009-07-05 16:58:15

Pandigital Processed Primes (in Numbers)
Submitted By Charlie. Solution posted on 2009-07-04 12:05:00

Fly on a cone (in Just Math)
Submitted By Bractals. Solution posted on 2009-07-01 17:39:14

3x3 Nim (in Games)
Submitted By Jer. Solution posted on 2009-07-01 11:40:30

Pair formed Sequence (in Sequences)
Submitted By Jer. Solution posted on 2009-06-23 00:06:30

Please log in:

Login:
Password:
Remember me:

Sign up! \| Forgot password

Search:

Search body:

Forums (0)
Newest Problems
Random Problem
FAQ | About This Site
Site Statistics
New Comments (1)
Unsolved Problems
Top Rated Problems
This month's top
Most Commented On

Chatterbox:


perplexus dot info