All about flooble | fun stuff | Get a free chatterbox | Free JavaScript | Avatars    
perplexus dot info
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!
> Logic> Probability> Shapes (1)> General
> Numbers (1)> Games> Paradoxes> Riddles
> Just Math> Science> Algorithms
Difficulty: 2 of 5 Latest: 2 absent digits (in Numbers)
The product of 722*227 (163,894) contains neither 2 nor 7. List all the couples (b,c; b>c) such that the product bcc*ccb contains neither b nor c. Bonus: From the above list select couples, if any, using none of the corresponding digits in the partial products as well.
(No Solution Yet, 4 Comments) Submitted on 2020-11-28 by Ady TZIDON   
Difficulty: 3 of 5 Bonus: How many perfect squares (in Just Math) Rating: 3.00
Suppose a and b are positive integers. We all know that aČ+2ab+bČ is a perfect square. Give an example where also aČ+ab+bČ is a perfect square. How many such examples exist?
(Solution Posted, 19 Comments) Submitted on 2006-04-25 by Salil   
Difficulty: 3 of 5Find the third side (in Geometry)
Posted on 2020-11-27 by Danish Ahmed Khan (No Solution Yet, 1 Comments)
Difficulty: 3 of 5Lcm equation (in Numbers)
Posted on 2020-11-26 by Danish Ahmed Khan (No Solution Yet, 1 Comments)
Difficulty: 3 of 5Maximal of a function (in Calculus)
Posted on 2020-11-25 by Danish Ahmed Khan (No Solution Yet, 2 Comments)
Difficulty: 2 of 5Rubik's cut (in Just Math)
Posted on 2020-11-24 by Danish Ahmed Khan (No Solution Yet, 2 Comments)
Difficulty: 2 of 5Calculator at rescue? (in Just Math)
Posted on 2020-11-23 by Danish Ahmed Khan (No Solution Yet, 2 Comments)
Difficulty: 3 of 5Locus to trisect the triangle (in Just Math)
Posted on 2020-11-22 by Danish Ahmed Khan (No Solution Yet, 1 Comments)
Difficulty: 3 of 5Go Discriminant! (in Just Math)
Posted on 2020-11-21 by Danish Ahmed Khan (No Solution Yet, 3 Comments)
Difficulty: 3 of 5Quad in quad (in Geometry)
Posted on 2020-11-20 by Danish Ahmed Khan (No Solution Yet, 0 Comments)
Difficulty: 3 of 5Radicals inside box (in Numbers)
Posted on 2020-11-19 by Danish Ahmed Khan (No Solution Yet, 0 Comments)
Difficulty: 2 of 5Why Fight II (in Numbers)
Posted on 2020-11-18 by Steven Lord (No Solution Yet, 1 Comments)
Difficulty: 3 of 5Microscopically small (in Numbers)
Posted on 2020-11-17 by Danish Ahmed Khan (No Solution Yet, 2 Comments)
Difficulty: 3 of 5Naoish numbers (in Numbers)
Posted on 2020-11-16 by Danish Ahmed Khan (No Solution Yet, 1 Comments)
Difficulty: 2 of 5Go left of the number (in Numbers) Rating: 3.00
Posted on 2020-11-15 by Danish Ahmed Khan (No Solution Yet, 3 Comments)
Difficulty: 3 of 5Exponentiation Equals Concatenation (in Numbers) Rating: 2.00
Posted on 2020-11-14 by Larry (No Solution Yet, 3 Comments)

Recently Posted Solutions:
Difficulty: 4 of 5hiDDen maMMals (in Word Problems)
Submitted By Ady TZIDON. Solution posted on 2020-11-25 04:54:53
Difficulty: 1 of 5Truthful days (in Logic)
Submitted By Math Man. Solution posted on 2020-11-17 06:20:39
Difficulty: 4 of 5pot draw permutations (in Numbers)
Submitted By Steven Lord. Solution posted on 2020-11-15 13:40:37
Difficulty: 3 of 5Gold-in pyramid (in Shapes)
Submitted By Jer. Solution posted on 2020-10-13 12:36:11
Difficulty: 2 of 5Countries Grand Kids (in Word Problems)
Submitted By Charlie. Solution posted on 2020-10-13 10:14:52
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 (5)
Unsolved Problems
Top Rated Problems
This month's top
Most Commented On

Chatterbox:
Copyright © 2002 - 2020 by Animus Pactum Consulting. All rights reserved. Privacy Information