alleryIf P(A) = 0.5, P(B) = 0.6, and P(A ∩ B) = 0.2, then P(A ∪ B) is:
A$0.9$
B$1.1$
C$1.0$
D$0.3$
Answer & Solution
Correct answer: A. $0.9$
We have P(A ∪ B) = P(A) + P(B) − P(A ∩ B).
That is P(A ∪ B) = 0.5 + 0.6 − 0.2.
So P(A ∪ B) = 0.9.
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