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What is the value of \(\frac{8!}{5!}+\frac{6!}{4!}-4!\)?

Answer and explanation

Correct answer: 342

\(\frac{8!}{5!}=8\times7\times6=336\), since \(5!\) cancels out. Similarly, \(\frac{6!}{4!}=6\times5=30\), and \(4!=24\). Therefore, the value is \(336+30-24=342\). Choosing \(336\) would ignore the effect of the second term and \(4!\). Exam tip: In factorial fractions, cancel the common factorial first and then multiply the remaining factors.

Related tags

Factorial NotationFactorial SimplificationPermutations And CombinationsClass 11 MathematicsMathematicsClass 11 Mcq

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