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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!
> Logic> Probability> Shapes> General (1)
> Numbers (1)> Games> Paradoxes> Riddles
> Just Math (2)> Science> Algorithms
The number of terms of a geometric sequence is even.
  1. The sum of the odd terms, that is - terms in the odd places (First term + Third Term + Fifth Term + ... and so on) is 4329
  2. The sum of the even terms, that is – terms in the even places (Second Term + Fourth Term + Sixth Term + ... and so on) is 5772
  3. The last term exceeds the first by 2343
Determine the geometric sequence.

(No Solution Yet, 2 Comments) Submitted on 2014-11-26 by K Sengupta   
Difficulty: 3 of 5 Bonus: Two ways up (in Shapes) Rating: 2.75
A tower, 200 feet high, has an elevator inside it, and a spiral stairway winding its way around the tower at a constant 30 degree angle with the horisontal.

Given the tower's radius of 10 feet, what is the difference between the distance covered by a person going up in the elevator, versus one climbing the stairs?

(Solution Posted, 13 Comments) Submitted on 2002-05-05 by levik   
Difficulty: 3 of 5Near Pandigital Ponder (in Just Math)
Posted on 2014-11-26 by K Sengupta (No Solution Yet, 0 Comments)
Difficulty: 3 of 5Extraordinaire (in General) Rating: 2.00
Posted on 2014-11-25 by Ady TZIDON (No Solution Yet, 5 Comments)
Difficulty: 1 of 5Fifteen Multiple Muse (in Just Math)
Posted on 2014-11-25 by K Sengupta (No Solution Yet, 1 Comments)
Difficulty: 4 of 5A cryptic toast (in Cryptography)
Posted on 2014-11-24 by Ady TZIDON (No Solution Yet, 1 Comments)
Difficulty: 2 of 5Seven Age Settlement (in Logic)
Posted on 2014-11-24 by K Sengupta (No Solution Yet, 4 Comments)
Difficulty: 2 of 5Searching for c among the cubes (in Just Math)
Posted on 2014-11-23 by broll (No Solution Yet, 0 Comments)
Difficulty: 3 of 5Harmonic Power Treat (in Just Math)
Posted on 2014-11-22 by K Sengupta (No Solution Yet, 2 Comments)
Difficulty: 3 of 5Two cities + (in Cryptography)
Posted on 2014-11-21 by Ady TZIDON (No Solution Yet, 8 Comments)
Difficulty: 3 of 5To a fifth of the wind, that pierces us most (in Famous Riddles)
Posted on 2014-11-21 by K Sengupta (No Solution Yet, 1 Comments)
Difficulty: 3 of 5Phrase Order Ponder (in Word Problems)
Posted on 2014-11-20 by K Sengupta (No Solution Yet, 2 Comments)
Difficulty: 3 of 5Minimum Value Muse 2 (in Just Math)
Posted on 2014-11-20 by K Sengupta (No Solution Yet, 2 Comments)
Difficulty: 3 of 5Simultaneous Satisfaction II (in Just Math) Rating: 3.00
Posted on 2014-11-19 by K Sengupta (No Solution Yet, 1 Comments)
Difficulty: 3 of 5A symmetric relation (in Just Math)
Posted on 2014-11-19 by Ady TZIDON (Solution Posted, 5 Comments)
Difficulty: 3 of 5Real Resolution II (in Just Math)
Posted on 2014-11-18 by K Sengupta (No Solution Yet, 1 Comments)

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