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What is the value of (13! − 12!) / 11!?

Answer and explanation

Correct answer: 144

The governing concept is factoring a common factorial from a difference. Express 13! as 13 × 12!, so 13! − 12! = 13 × 12! − 12! = 12 × 12!. Now use 12! = 12 × 11!, which gives 12 × 12! / 11! = 12 × (12 × 11!) / 11! = 12 × 12 = 144. Hence option A is correct. Equivalently, dividing each factorial by 11! first gives 13×12 − 12 = 156−12 = 144. Option B subtracts incorrectly, option C corresponds to the first expanded product without the subtraction, and option D is not obtained from the factorial identities.

Related tags

Factorial NotationCommon FactorSubtractionClass 11Permutations And CombinationsMathematicsClass 11 Mcq

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