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 (1)> Science> Algorithms
A sequence {A(n)} for n = 1 to 8 is defined as:
A(1) = 2015, A(2) = 2/A(1), A(3) = 3/A(2), .....
A(7) = 7/A(6) and A(8) = 8/A(7)

Find A(1)*A(2)*....*A(8)

(No Solution Yet, 0 Comments) Submitted on 2015-03-02 by K Sengupta   
Difficulty: 3 of 5 Bonus: No trigonometry, no algebra (in Geometry) Rating: 3.00
Look at the drawing below, where AB = BC = CD = DT = h, and TD perpendicular to AD:
                                   
                                   o T
                                   |
                                   | (h) 
                                   |
                                   |
  +----------+----------+----------o 
  A    (h)   B    (h)   C    (h)   D
The line AT makes an angle x with AD; the line BT makes an angle y with BD; the line CT makes an angle z with CD.

Using only geometry, prove that (angle x) + (angle y) = (angle z).

(Solution Posted, 10 Comments) Submitted on 2005-12-23 by pcbouhid   
Difficulty: 2 of 5Rational Rubric (in Just Math) Rating: 4.00
Posted on 2015-03-01 by K Sengupta (No Solution Yet, 2 Comments)
Difficulty: 2 of 5Equilateral fun (in Geometry)
Posted on 2015-02-28 by Danish Ahmed Khan (No Solution Yet, 2 Comments)
Difficulty: 4 of 5Back to the Bard (in Cryptography)
Posted on 2015-02-27 by Ady TZIDON (No Solution Yet, 2 Comments)
Difficulty: 2 of 5Prime and perfect (in Numbers)
Posted on 2015-02-27 by Danish Ahmed Khan (No Solution Yet, 3 Comments)
Difficulty: 3 of 5Cinq Celeb Commonality (in Riddles)
Posted on 2015-02-26 by K Sengupta (No Solution Yet, 1 Comments)
Difficulty: 3 of 5Academia, defeated, yesterday (in Word Problems)
Posted on 2015-02-26 by Ady TZIDON (No Solution Yet, 5 Comments)
Difficulty: 3 of 5Point Construction Ponder (in Shapes)
Posted on 2015-02-25 by K Sengupta (No Solution Yet, 5 Comments)
Difficulty: 2 of 5Next year vs the current year (in Numbers)
Posted on 2015-02-25 by Ady TZIDON (No Solution Yet, 5 Comments)
Difficulty: 3 of 5No other case (in Just Math)
Posted on 2015-02-24 by Ady TZIDON (No Solution Yet, 2 Comments)
Difficulty: 1 of 5Composite prime (in Numbers) Rating: 5.00
Posted on 2015-02-24 by Math Man (No Solution Yet, 2 Comments)
Difficulty: 3 of 5Bamboo Baffle (in Riddles)
Posted on 2015-02-23 by K Sengupta (No Solution Yet, 2 Comments)
Difficulty: 1 of 5Cryptajoke III (in Logic)
Posted on 2015-02-23 by Ady TZIDON (No Solution Yet, 2 Comments)
Difficulty: 3 of 5Integer Polynomial Illation (in Just Math)
Posted on 2015-02-22 by K Sengupta (No Solution Yet, 1 Comments)
Difficulty: 3 of 5Cubic Difference Conclusion (in Just Math) Rating: 4.00
Posted on 2015-02-21 by K Sengupta (No Solution Yet, 1 Comments)

Recently Posted Solutions:
Difficulty: 2 of 5Is it easy? (in Cryptography)
Submitted By Ady TZIDON. Solution posted on 2015-02-18 17:52:34
Difficulty: 3 of 5Deux Digit Determination (in Just Math)
Submitted By K Sengupta. Solution posted on 2015-01-20 06:59:00
Difficulty: 3 of 5Chinese New Year (in General)
Submitted By broll. Solution posted on 2015-01-19 03:21:41
Difficulty: 3 of 5Two squares in a circle (in Geometry)
Submitted By broll. Solution posted on 2015-01-14 05:57:02
Difficulty: 3 of 5So close, but no closer... (in Just Math)
Submitted By broll. Solution posted on 2015-01-14 05:52:28
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 (4)
Unsolved Problems
Top Rated Problems
This month's top
Most Commented On

Chatterbox:
Copyright © 2002 - 2015 by Animus Pactum Consulting. All rights reserved. Privacy Information