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Which expression represents the number of ways to select 3 books from 8 distinct books and arrange them in order on a shelf?

Answer and explanation

Correct answer: \({}^{8}P_{3}\)

Use permutations when order matters. Here, 3 books are selected and arranged from 8, so the expression is \({}^{8}P_{3}=\frac{8!}{5!}\). \({}^{8}C_{3}\) counts selection only, not arrangement. Exam tip: look for words such as “arrange” or “order.”

Related tags

PermutationsArrangementsOrder MattersClass 11 MathematicsPermutations And CombinationsMathematicsClass 11 Mcq

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