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\(8\times7\times6\times5!\) is equal to which of the following?

Answer and explanation

Correct answer: \(8!\)

By factorial expansion, \(8!=8\times7\times6\times5!\). Hence, the given expression equals \(8!\). In contrast, \(7!=7\times6\times5!\), so it does not include the factor 8. Exam tip: Match consecutive descending factors with the factorial at the end to identify the required factorial.

Related tags

Factorial NotationPermutations And CombinationsClass 11MathematicsFactorial ExpansionClass 11 Mcq

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