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What will be the value of (6!-5!)?

Answer and explanation

Correct answer: (600)

A factorial is the product of all positive integers from the given number down to \(1\). Thus \(6!=6\times5\times4\times3\times2\times1=720\), while \(5!=5\times4\times3\times2\times1=120\). The expression asks for subtraction, not multiplication or division, so the two factorial values must be found and then subtracted in the stated order.

Substitute the factorial values: \(6!-5!=720-120\). Subtracting gives \(720-120=600\). Therefore the value of the expression is \(600\), which matches option A. A common error is to remember \(6!=720\) but forget to subtract \(5!=120\), or to confuse the expression with \(6\times5!\). The given answer is consistent.

Related tags

Factorial NotationPermutations CombinationsClass 11Easy

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