|A union B| + |A interjection B| = 18, |A|= 13, |B| = ?
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Answer:
P(B) = 5 is the required answer.
Step-by-step explanation:
P( A U B) = P(A) + P(B) - P(A ∩ B)
P(B) = P( A U B) + P(A ∩ B) - P(A)
P(B) = 18-13 = 5
P(B) = 5
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