Question: 10. Let Zi be the indicator function that the i th box is empty. The total number of empty boxes is S = Z1 +
10. Let Zi be the indicator function that the i th box is empty. The total number of empty boxes is S = Z1 + Z2 + · · · + ZM. Also, E(Zi ) = (M − 1)N /MN and E(S) =
ME(Z1).
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