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Let X = {x : 1 ≤ x ≤ 50, x ∈ N}A = {x: x is multiple of 2}B = {x: x is multiple of 7}Then find number of elements in the smallest subset of X which contain elements of both A and B |
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Answer» n(A ∪ B) = n(A) + n(B) - n(A ∩ B) = 25 + 7 - 3 = 29 |
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