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From (9) different prizes, (3) prizes are to be kept in an exhibition and one particular prize must not be kept. How many ways are there?

Answer and explanation

Correct answer: 56

Exclude the particular prize that must not be displayed. This leaves 8 prizes, and we need to select 3 of them. Since the order of selected prizes does not matter, the number of ways is \(\binom{8}{3}=56\). The value 84 would result from incorrectly choosing 3 prizes from all 9 prizes. Exam tip: use combinations, \(\binom{n}{r}\), when order is not important.

Related tags

CombinationsPermutations And CombinationsClass 11Selection ProblemsBinomial CoefficientMathematicsClass 11 Mcq

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