There are k types of coupons. Independently of the types of previously collected coupons, each new coupon

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There are k types of coupons. Independently of the types of previously collected coupons, each new coupon collected is of type i with probability
There are k types of coupons. Independently of the types

the expected number of distinct types that appear in this set. (That is, find the expected number of types of coupons that appear at least once in the set of n coupons.)

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...
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