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प्रश्न
If A = {3, 5, 7, 9, 11} and B = {4, 7, 10}, find: (A – B) and n(A – B)
उत्तर
(A – B) and n(A – B)
⇒ (A – B) = (2, 4, 8)
⇒ n(A - B) = 3
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