You play a game with someone, the rule is to take turns to put a quarter on a round table ( can be any size, but must be of symmetrical shape). You are trying to cover the table up with quarters, you lose when there's no place for you to put down the quarter. Should you be the first person to play ?
Find the minimum of x^x
What is the number of ways to reach n-th step of a stair if one can jump up either 1 step or 2 steps?
If W is standard Brownian Motion, for what values of n is W^n still a martingale?
In a set of cereals, there are 4 kinds of coupons. A child wants to collect all the 4 kinds of coupons. How many boxes in average should he buy?
Get uniform distribution of number between 1 and 7 by rolling dice
n people standing in a row with all of them having different heights. Expected position of the tallest guy.
1. Let x～Uniform(0,1) and y～Uniform(0,2) be independent random variables, what\'s expectation of |x−y|?. 1point 3acres 论
Run one iteration of bubble sort. What's the probability that the array is now sorted?
(NDA so nothing specific): Easy probability/brainteaser problems, Markov chains are important
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