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What is the value of \( \frac{12!}{6!\cdot6!}-\frac{11!}{5!\cdot6!} \)?

Answer and explanation

Correct answer: 462

The first term is \(\frac{12!}{6!6!}=\binom{12}{6}=924\). The second term is \(\frac{11!}{5!6!}=\binom{11}{5}=462\). Therefore, the required value is \(924-462=462\). An answer such as 420 can result from incomplete simplification of the factorial terms. Exam tip: Recognise expressions of the form \(\frac{n!}{r!(n-r)!}\) as combinations to calculate quickly.

Related tags

Factorial NotationBinomial CoefficientsPermutations And CombinationsFactorial SimplificationClass 11 MathematicsMathematicsClass 11 Mcq

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