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How many ways are there to select (5) students from (6) students for a competition?

Answer and explanation

Correct answer: 6

This is a selection problem, so order does not matter. Therefore, the number of ways is \(\binom{6}{5}=\binom{6}{1}=6\). Equivalently, exactly one of the 6 students is left out, and there are 6 choices for that student. Option 5 is the number of students selected, not the number of selections. Exam tip: use \(\binom{n}{r}\) when order is not involved in a selection.

Related tags

CombinationsPermutations And CombinationsClass 11Student SelectionBinomial CoefficientMathematicsClass 11 Mcq

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