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How many ways are there to choose (4) subjects from (6) subjects?

Answer and explanation

Correct answer: 15

This is a selection problem, so the order of subjects does not matter. Hence, the number of ways is \(\binom{6}{4}=\frac{6!}{4!\,2!}=15\). The value 24 may arise from an incorrect arrangement-based calculation, but no order is involved in choosing subjects. Exam tip: use \(\binom{n}{r}\) when only selection is required.

Related tags

CombinationsPermutations And CombinationsClass 11SelectionBinomial CoefficientMathematicsClass 11 Mcq

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