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If \(a=\frac{8!}{6!}\) and \(b=3!\), what is the value of (a-b)?

Answer and explanation

Correct answer: 50

Since \(8!=8\times7\times6!\), \(a=\frac{8!}{6!}=8\times7=56\). Also, \(b=3!=3\times2\times1=6\). Hence, \(a-b=56-6=50\). Option 56 gives only the value of \(a\); it does not subtract \(b\). Exam tip: In a factorial fraction, expand the larger factorial up to the smaller one and cancel common factors first.

Related tags

Factorial NotationFactorial SimplificationPermutations And CombinationsClass 11 MathematicsMathematicsClass 11 Mcq

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