Continuation. Let Y, be the number of drawings required to include r preassigned elements (instead of any

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Continuation. Let Y, be the number of drawings required to include r preassigned elements (instead of any r different elements as in the text). Find E(Y) and Var (Y,). (Note: The exact distribution of Y, was found in problem 12 of II, 11 but is not required for the present purpose.)

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