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If P(A) = 0.4, P(B) = 0.5 and P(A and B) = 0.2, then P(A or B) is
A0.7
B0.9
C0.6
D0.8
Answer & Solution
Correct answer: A. 0.7
Add the two and subtract the overlap counted twice: 0.4 + 0.5 - 0.2 = 0.7.
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