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प्रश्न
If A and B are subsets of the universal set X and n(X) = 50, n(A) = 35, n(B) = 20, n(A' ∩ B') = 5, find: n(A ∩ B')
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उत्तर
n(X) = 50, n(A) = 35, n(B) = 20, n(A' ∩ B') = 5
n(A ∩ B') = n(A) – n(A ∩ B)
= 35 – 10
= 25
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