If P(A)=0.5, P(B)=0.4, and P(A∩B)=0.2, then P(A∪B) equals: MCQ with Answer and Explanation

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If P(A)=0.5, P(B)=0.4, and P(A∩B)=0.2, then P(A∪B) equals:

A. 0.7

B. 0.5

C. 0.2

D. 0.9

Answer: Option A

Solution (By JKSSB Mock Tests)

By addition theorem: P(A∪B) = P(A) + P(B) - P(A∩B) = 0.5 + 0.4 - 0.2 = 0.7.

This question belongs to: Accountancy and Statistics Statistics

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