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Let A and B be two events such that P(B\A) 5 2 , P(A\B) = 7 1 and P(A ∩ B) = 9 1 . Consider (S1) P(A ′ ∪ B) = 6 5 , (S2) P(A ′ ∩ B ′ ) = 18 1 . Then

1. Both (S1) and (S2) are true
2. Both (S1) and (S2) are false
3. Only (S1) is true
4. Only (S2) is true

Correct answer: Both (S1) and (S2) are true

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