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What is the value of \( \frac{9!}{4!\cdot5!}-\frac{8!}{4!\cdot4!} \)?

Answer and explanation

Correct answer: 56

\(\frac{9!}{4!5!}=\binom{9}{4}=126\) and \(\frac{8!}{4!4!}=\binom{8}{4}=70\). Therefore, the required value is \(126-70=56\). Option 54 is a close distractor, but it does not result from the correct subtraction. Exam tip: Recognising \(\frac{n!}{r!(n-r)!}\) as \(\binom{n}{r}\) makes such calculations quicker.

Related tags

Factorial NotationBinomial CoefficientsPermutations And CombinationsFactorial SimplificationClass 11 MathematicsMathematicsClass 11 Mcq

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