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Which expression represents the number of ways of selecting r objects from n distinct objects and arranging them in order?

Answer and explanation

Correct answer: \({}^nP_r\)

Changing the order of the selected r objects creates a new arrangement, so it is a permutation: \({}^nP_r\). \({}^nC_r\) does not count order. Exam tip: choose P whenever order matters.

Related tags

PermutationsArrangementsOrder MattersNpr NotationClass 11 MathematicsPermutations And CombinationsMathematicsClass 11 Mcq

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