a) You need to use the formula for the number of ways of choosing r items/people from n items/people

`C(n,r) = (n!)/(r!(n-r)!)`

We say 'n choose r'

Here `n=17` and `r=3` so the number of ways is

`C(17,3) = (17!)/(3!14!) = (17.16.15.14.13...3.2.1)/((3.2.1)(14.13.12...3.2.1))=(17.16.15)/(3.2.1)`

Cancelling on the top and bottom...

(The entire section contains 109 words.)

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