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प्रश्न
Let n(A) 30, n(B) = 27 and n(A∪B) = 45, find: n(B - A).
उत्तर
n(A) = 30, n(B) = 27 and n(A ∪ B) = 45
We know that,
n(B – A) = n(B) – n(A n B)
n(B – A) = 20 – 6 = 14
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