1. An urn contains 2 red balls and 2 whote balls. 2 balls are drawn successively without replacement. Let X be the number of trials until 2 red balls are drawn. Find P(X=2);P(X=3);P(X=4) & E(X)

2.suppose there is an average of 2 suicides per year per 50000 population. In a city of 100000 people,find the probability that 0 suicides per year,not more than 3 suicides in two years,2 suicides in two years and at most 1 suicide per year.