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Suppose Set B contains 69 elements and the total number elements in either Set A or Set B is 107. If the Sets A and B have 13 elements in common, how many elements are contained in set A?

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  1. Union is 107
    Intersection is 13

    draw Venn diagram

    69 + A alone = 107
    so
    A alone = 38
    plus A and B = 38+13 = 51

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