Quant, Math & Computer Science Puzzles for Interview Preparation & Brain Teasing
A collection of ~225 Puzzles with Solutions (classified by difficulty and topic)

Feb 16, 2014

(2n choose n) is never a perfect power

Source: Cute problem sent by Sudeep Kanath

Problem: Prove that (2n choose n) is never a perfect power

Update ( 21 June 2014 ):
Solution: Posted by Sandeep, Dinesh Krithivasan and Vishal Khatri in comments.


Feb 10, 2014

Coin Problem - Wolfram Mathematica Puzzle


Source: The super awesome puzzle blog by Gowtham Kumar - Puzzle Tweeter - Coin Problem who got it from Wolfram Mathematica

Problem:
Suppose you have an infinite stock of $a bills and $b bills such that g.c.d(a,b)=1. Find the largest amount of money (integer) that cannot be represented using $a and $b denominations.

Shameless plug:
If you have not done it already, please like / +1 / follow on: QuoraTwitterFacebookG+

Update (21 June 2014):
Solution: Posted by Raunak Kudesia, Sid Hollander and me (Pratik) in comments!