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How many ways are there to arrange (4) badges from (10) different badges in order?

Answer and explanation

Correct answer: 5040

This is a permutation question because the order of the badges matters. Therefore, \({}^{10}P_{4}=10\times9\times8\times7=5040\). The value 210 is \({}^{10}C_{4}\), which counts only selections, not arrangements. Exam tip: use permutations whenever changing the order changes the outcome.

Related tags

PermutationsArrangementsClass 11 MathematicsCounting PrincipleOrdered SelectionPermutations And CombinationsMathematicsClass 11 Mcq

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