If n(A) = 5, n(B) = 7 and A is subset of B, then number of elements in A ∩ B is (1) 2 (2) 7 (3) 5 (4) 12
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answer is 5
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as the elements in A are there in B
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n(A) = 5, n(B) = 7 and A is subset of B, then number of elements in A ∩ B is 5 .
as A is subset of B , so all elements of A is , common part between a & b ( A ∩ B)
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