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15 November, 16:14

Ben has 100 toys. 43 of them are new, 15 are his favorites; 1 is new and favorite. Ben is going to give away all the toys that are neither new nor favorite. How many toys will he give away?

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  1. 15 November, 18:00
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    43

    Step-by-step explanation:

    since 43 of them are new, and 15 of them are his favorite, that means that 43+15 58 are new and favorite. In addition, we have one that is both, and since

    P (A or B) = P (A) + P (B) - P (A and B)

    we have 43+15-1 = 57.

    100-57 is 43.
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