Originally Posted by

**maibs89** Peter was given *n *one-dollar scratch tickets, each winning:

$2 with probability 1/8

$10 ------------- 1/100

$1000 ----------- 1/10,000

$20000 ---------- 1/1,000,000

1. Let An , where n is a subscript, be the event that Peter wins on at least one of the *n *tickets he was given. Compute Pr(A8).

2. What is the minimum number of *n *tickets Peter should be given to ensure that Pr(An)>0.5?

3. Compute the expected value of Peter's winnings when *n*=8.

How do I do these questions?