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Russian roulette

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Probability of getting at least one phone call each day

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Post-order traversal of a BST

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Equal-distance points on a sphere

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Basketball scores

You are playing Russian roulette with a six chamber revolver,

you load 2 bullets into the revolver in adjacent chambers. You spin

the barrel place the gun to your head ...

My telephone rings 12 times each week, the calls being randomly distributed among the 7 days. What is the probability that I get at least one call each day?

Tags: probability combinatorics

Determine if a given array can be the post-order traversal

of a binary search tree. For example, [1,3,2] is the post

order traversal of the binary search tree

Tags: binary_tree algorithm

What's the maximum number of dots one can paint on a ball, so that the distance between all dots are equal.

A basketball player is taking 100 free throws. She scores one point if the ball passes through the hoop and zero point if she misses. She has scored on her ...

Tags: probability puzzle