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From (15) candidates (5) prize winners are to be selected and all prizes are identical. How many ways are there?

Answer and explanation

Correct answer: 3003

Since all the prizes are identical, the order of the 5 selected candidates does not matter. Hence, the number of selections is
\(\binom{15}{5}=\frac{15!}{5!\,10!}=3003\). The value 360360 is \(^{15}P_5\), which would apply if the prizes were distinct. Exam tip: when identical items are awarded, use combinations because order is irrelevant.

Related tags

CombinationsClass 11 MathematicsIdentical PrizesSelection Without OrderBinomial CoefficientPermutations And CombinationsMathematicsClass 11 Mcq

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