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In how many ways can a duty team of (5) volunteers be selected from (10) volunteers?

Answer and explanation

Correct answer: (252)

Selecting a duty team means choosing five volunteers, with no positions or order specified. Therefore this is a combination problem. The number of ways is \(\binom{10}{5}=\frac{10!}{5!5!}\). Cancelling the factorials or using the product form gives \(\frac{10\times9\times8\times7\times6}{5\times4\times3\times2\times1}=252\).

Order is not counted separately: the same five volunteers form one team regardless of which name is written first. Using \(10!\) would count arrangements rather than teams and would greatly overcount. Thus the number of possible duty teams is 252, which is option B. The equality \(\binom{10}{5}=\binom{10}{5}\) also reflects that choosing five members is equivalent to leaving the other five out.

Related tags

CombinationsClass11Easy

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