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Suppose that X1, X2, X3 are independent, have mean 0 and Var(Xi) = i. Find Cov(X1...

Suppose that X1, X2, X3 are independent, have mean 0 and Var(Xi) = i. Find Cov(X1 − X2, X2 + X3).

.For X1, X2, X3,  find ρ(X1−X2, X2+ X3).

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