20. (5%) The moment generating function of X is given byand that of y by . if x and Y ang tadependen, what is P{XY = 0}? (A) (B) (C) (D) (E)

4. (5%) Let A be an m by n matrix. Which statement is TRUE? (A) The null space of A is a subspace of the column space of AT (B) The dimension of the null space of A plus the dimension of the row space of A is (C) The null space of AT equals column space of A (D) The column space of A is orthogonal to the row space of AT (E) The direct sum of the row space of A and the null space of AT is Rm

20. (5%) The moment generating function of X is given byand that of y by . if x and Y ang tadependen, what is P{XY = 0}?
(A)
(B)
(C)
(D)
(E)

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