(E) none of these
31.
(A) 1
(B)
(C)
(D) −1
(E) none of these
32.
(A)
(B)
(C) 3
(D) 1
(E) none of these
33.
(A) 6
(B)
(C)
(D) 0
(E) none of these
34.
(A) 2
(B) −2
(C) 0
(D)
(E) none of these
(E) none of these
(E) none of these
(E) none of these
(E) none of these
(E) none of these