2.* Suppose that the random variables X1, X2, . . . ,Xn form n independent Bernoulli trials, each with parameter 7r. Determine the conditional probability that X1 = 1, given that: Tl. 2x1: k i=1 fork=1,2,...,n. 3.* Suppose that a book with n pages contains on average A typographical errors, i.e. \"typos\