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28 September, 12:21

How many subsets of the set {1, 2, 3, ..., 12} contain exactly one or two prime numbers?

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  1. 28 September, 14:11
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    15.

    Step-by-step explanation:

    The prime numbers in the set are 2, 3, 5, 7 and 11.

    So the answer is 5 + number of combinations of 2 from 5

    = 5 + 5C2

    = 5 + 10

    = 15.
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