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?

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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