Question: 9. Random variables X1, X2, . . . , XN have zero expectations, and E(Xm Xn) = vmn for m, n = 1, 2, .
9. Random variables X1, X2, . . . , XN have zero expectations, and E(Xm Xn) = vmn for m, n = 1, 2, . . . , N.
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