# Question: If X1 X2 X3 and X4 are pairwise uncorrelated random

If X1, X2, X3, and X4 are (pairwise) uncorrelated random variables, each having mean 0 and variance 1, compute the correlations of

(a) X1 + X2 and X2 + X3;

(b) X1 + X2 and X3 + X4.

(a) X1 + X2 and X2 + X3;

(b) X1 + X2 and X3 + X4.

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