Choose the correct answer in each of the following:
17 If A and B are two events such that P(A) ≠ 0 and P(B | A) = 1, then
(A) A ⊂ B
(B) B ⊂ A
(C) B = φ
(D) A = φ
18 If P(A|B) > P(A), then which of the following is correct :
(A) P(B|A) < P(B)
(B) P(A ∩ B) < P(A) P(B)
(C) P(B|A) > P(B)
(D) P(B|A) = P(B)
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