13 Balls problem: One of the hardest interview questions
Brush up on your logical deduction skills for your next tech interview.
One of the most classic puzzles involving balls is figuring out the odd one out using common balance. There are many levels of puzzles based on the same concept for different levels of interviews - Simple ones for phone interviews to the most gruelling 1 hour hard work needing hard ones.
Problem space
The general problem is you will be given n balls and one of them is either heavier or lighter and you are asked to find out the minimum number of weighings using a common balance required to find out the odd one out.
