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31 March, 21:33

A civil air patrol unit of fifteen members includes two two officers. in how many ways can four members be selected for a search and rescue mission such that at least one officer is included?

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  1. 31 March, 21:37
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    Answer: 1365 ways

    Explanation: this is a combination questions

    n = 15

    r = 4

    Solution

    15C⁴

    = n! / r! (n-r) !

    = 15! / 4! (15-4) !

    = 15! / 4! (11) !

    = 1.308 * 10¹² / 24 (39916800)

    = 1365 ways
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