If A and B are two sets such that the number of elements in A is 20, a number of elements in B is 18 and the number of elements in both A and B is 10, find n(A È B).
Given: - n(A) = 20 n(B) =18 n(A∩B) = 10 Substitute these values into the formula- n(AUB) =20+18-10 = 28
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