Originally Posted by

**pplteo**

(a) A man rolls a die for 10 times, find the probability that

(i) he gets 2 sixes, given that he gets 2 fives.

(ii) he doesn’t get the same number consecutively.

(i) Besides receive the prize, a visitor who spent more than 2 hours in the casino would receive an envelope with coupon. Coupons in envelopes were numbered 1 to 5, and a set of one of each was required for applying the VIP card. Assume all numbers are equally probable, with one coupon per envelope, how many envelopes on the average were required to apply the VIP card?