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How many ways are there to choose (3) pictures from (8) different pictures for an exhibition?

Answer and explanation

Correct answer: 56

Only 3 pictures are being selected, so the order in which they are displayed does not matter. Hence, use combinations: \(\binom{8}{3}=\frac{8!}{3!\,5!}=56\). Therefore, the correct answer is 56. The value 336, \(8\times7\times6\), would arise from permutations when order is considered important. Exam tip: When a question says “choose” or “select” and no order is specified, use combinations.

Related tags

CombinationsPermutations And CombinationsClass 11SelectionBinomial CoefficientMathematicsClass 11 Mcq

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