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\(14\times13!\) is equal to which of the following?

Answer and explanation

Correct answer: \(14!\)

By the factorial definition, \(n!=n\times(n-1)!\). Therefore, \(14!=14\times13!\), so the correct answer is \(14!\). The expression \(15!\) would require \(15\times14!\), so it is not correct. Exam tip: multiplying a factorial by its next integer gives the factorial of that integer.

Related tags

Factorial NotationFactorial IdentityPermutations And CombinationsClass 11 MathematicsMathematicsClass 11 Mcq

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