Question: 21. Let X1, X2, . . . , Xn be independent and identically distributed random variables such that P(X1 = 1) = P(X1 = 1)

21. Let X1, X2, . . . , Xn be independent and identically distributed random variables such that P(X1 = 1) = P(X1 = −1) = 1 2 .

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