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    Question

    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).
    A 8 Correct Answer Incorrect Answer
    B 38 Correct Answer Incorrect Answer
    C 18 Correct Answer Incorrect Answer
    D 28 Correct Answer Incorrect Answer

    Solution

    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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