There are n different types of coupons and each item must contain one coupon. So what is the expected number of items needed to buy for all n types of coupons have appeared at least once?
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See the Coupon Collector Problem – lulu Nov 12 '18 at 11:42
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Welcome to MSE. Please read this text about how to ask a good question. – José Carlos Santos Nov 12 '18 at 11:49