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If P(A) = 0.6, P(B) = 0.5 and P(A and B) = 0.2, then P(A or B) is
A0.5
B1.1
C0.7
D0.9
Answer & Solution
Correct answer: D. 0.9
1. General addition: P(A or B) = P(A) + P(B) - P(A and B).
2. = 0.6 + 0.5 - 0.2.
3. = 0.9.
4. So P(A or B) = 0.9.
_Source: ICAI BoS Foundation Paper 3, Ch 15 'Probability', p.9_
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