Let X and Y be two independent N(0, 1) random variables, and U = X + Y.

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Let X and Y be two independent N(0, 1) random variables, and U = X + Y.

a. Find the conditional PDF of U given X = x, fU|X(u|x).

b. Find the PDF of U, fU (u).

c. Find the conditional PDF of X given U = u, fX|U (x|u).

d. Find E[X|U = u], and V ar(X|U = u).

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