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Question is in the attachment. 4. In the coupon collecting problem discussed in class with n(> 3) differ- ent coupon possibilities, suppose only 3 of

Question is in the attachment.

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4. In the coupon collecting problem discussed in class with n(> 3) differ- ent coupon possibilities, suppose only 3 of them are of interest to you. Let X denote the number of trials till you get at least one of each of these three. Find (a) E(X), and (b) V(X)

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