Problem

Consider n independent trials, each resulting in any one of r possible outcomes with proba...

Consider n independent trials, each resulting in any one of r possible outcomes with probabilities Pl, P2,..., Pr. Let X denote the number of outcomes that never occur in any of the trials. Find E[X] and show that among all probability vectors Pl,..., Pr ,E[X] is minimized when Pi = 1/r, i = 1,..., r.

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