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How many ways are there to choose (6) files from (9) different files?

Answer and explanation

Correct answer: 84

This is a selection problem, not an arrangement problem, so combinations are used. The required number of ways is \(\binom{9}{6}=\frac{9!}{6!3!}=84\). Equivalently, \(\binom{9}{6}=\binom{9}{3}\), because choosing 6 files is the same as leaving out 3 files. The nearby distractor \(126\) is the value of \(\binom{9}{4}\), not \(\binom{9}{6}\). Exam tip: use \(nCr\) when the order of selection does not matter.

Related tags

CombinationsBinomial CoefficientClass 11 MathematicsFile SelectionNcrPermutations And CombinationsMathematicsClass 11 Mcq

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