1. If n(A) = 15, n(AU B) = 29, n(An B) = 7,then n(B) = ?
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Answer:
Answer is 21.
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Step-by-step explanation:
Given,
n(A) = 15
n(AUB) = 29
n(AnB) = 7
To find
n(B) = ?
We know,
n(AUB) = n(A) + n(B) - n(AnB)
=> 29 = 15 + n(B) -7
=> 29 = n(B) + 8
=> n(B) = 29-8
=> n(B) = 21
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