There are 4 different types of coupons, the first 2 of which comprise one group and the second 2 another group. Ead 2 new coupon obtained is type i with probability p, where p = P2 = 5 P3 P4 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. 1 Find the expected number of 10 (a) The expected number of coupons is (Type an integer or a simplified fraction.)