Q1: Brain teaser, very simple, about conditional probability Q2: statistical estimation, we need to know how to use CLT and the confidence interval, simple and easy Q3: Hard question, need some knowledge in Markov chain and conditional probability. The hardest part is that I was asked to answer the following question" explain your result intuitively， what is the reason for that expectation be that value?" Q4: Dice game question with infinite many rolls, it is a hard one and the result is really counter intuitive.
