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What is the value of (\frac{7!}{7\times6!})?

Answer and explanation

Correct answer: (1)

The factorial identity \(7!=7\times6!\) allows the numerator to be rewritten in exactly the same form as the denominator. The denominator is \(7\times6!\), so after expansion both numerator and denominator are equal. Since factorials of positive integers are non-zero, cancelling the common factor is valid and leaves a quotient of one equal quantity by itself.

Rewrite the numerator: \(7!=7\times6!\). Hence \(\frac{7!}{7\times6!}=\frac{7\times6!}{7\times6!}=1\). Equivalently, cancel \(7\) and \(6!\) from the numerator and denominator. Therefore option B, \(1\), is correct. The answer is not \(7\) or \(6\), because those factors cancel rather than remain in the quotient.

Related tags

Factorial NotationPermutations CombinationsClass 11Easy

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