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प्रश्न
Let A and B be two sets such that n(A) = 75, M(B) = 65 and n(A ∩ B) = 45, find: n(B – A)
उत्तर
n(A) = 75, n(B) = 65 and n(A ∩ B) = 45
We know that,
n(B – A) = n(B) – n(A ∩ B) n(B – A)
= 65 – 45 = 20
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