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What is the value of (\frac{12!}{10!})?

Answer and explanation

Correct answer: (132)

The factorial symbol means multiplying all positive integers down to 1. In a quotient of factorials, the smaller factorial can be cancelled from the larger one. This leaves only the factors that occur in the larger factorial but not in the smaller factorial. The required option is C, because the remaining product is 132.

Write \(12!\) as \(12\times11\times10!\). Then \(\frac{12!}{10!}=\frac{12\times11\times10!}{10!}=12\times11=132\). The \(10!\) factors cancel, not the factors 12 and 11. Therefore option C is correct. Options 110 and 120 do not use the correct two remaining factors, while 144 is an incorrect product.

Related tags

Factorial NotationPermutations CombinationsClass 11Easy

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