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What is the value of \( \frac{8!}{5!}+\frac{7!}{4!} \)?

Answer and explanation

Correct answer: 546

\(\frac{8!}{5!}=8\times7\times6=336\), since \(5!\) cancels out. Similarly, \(\frac{7!}{4!}=7\times6\times5=210\). Therefore, the value is \(336+210=546\). Option 504 is only the value of neither complete sum and is incorrect. Exam tip: Expand the larger factorial only up to the smaller factorial, then cancel the common factorial term.

Related tags

Factorial NotationFactorial SimplificationPermutations And CombinationsArithmetic EvaluationClass 11 MathematicsMathematicsClass 11 Mcq

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