There are 4 different types of coupons, the first 2 of which compose one group and the second 2 another group Each new coupon obtained is type I with probability pi, where p1 p2 1 8, p3 p4 3 8 Find the expected number of coupons that one must obtain to have at least one of (a) All 4 types (b) All t...

Let X ii be the number of coupons one needs to collec ...

There are 4 different types of coupons, the first 2 of which compose one group and the

Question:

There are 4 different types of coupons, the first 2 of which compose one group and the second 2 another group. Each new obtained is type I with probability pi, where p1 = p2 = 1/8, p3 = p4 = 3/8. Find the expected number of coupons that one must obtain to have at least one of
(a) All 4 types;
(b) All the types of the first group;
(c) All the types of the second group;
(d) All the types of either group. Coupon
A coupon or coupon payment is the annual interest rate paid on a bond, expressed as a percentage of the face value and paid from issue date until maturity. Coupons are usually referred to in terms of the coupon rate (the sum of coupons paid in a...