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How many ways are there to arrange (3) charts from (11) different charts in order?

Answer and explanation

Correct answer: 990

This is a permutation question because changing the order of the selected 3 charts gives a different arrangement. Therefore, the number of arrangements is \({}^{11}P_{3}=11\times10\times9=990\). Option 165 is \({}^{11}C_{3}\), which counts selections without considering order. Exam tip: Words such as “arrange” or “in order” usually indicate permutations.

Related tags

PermutationsOrdered ArrangementsClass 11 MathematicsCounting PrinciplesPermutation FormulaPermutations And CombinationsMathematicsClass 11 Mcq

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