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What is the value of \( \frac{13!}{6!\cdot7!}-\frac{12!}{6!\cdot6!} \)?

Answer and explanation

Correct answer: 792

The first term is \(\frac{13!}{6!\cdot7!}=\binom{13}{6}=1716\), and the second term is \(\frac{12!}{6!\cdot6!}=\binom{12}{6}=924\). Hence, the value is \(1716-924=792\). Option 846 may result from evaluating the second binomial coefficient incorrectly. Exam tip: recognise \(\frac{n!}{r!(n-r)!}\) as \(\binom{n}{r}\) to calculate quickly.

Related tags

Factorial NotationBinomial CoefficientsPermutations And CombinationsCombinatoricsClass 11MathematicsClass 11 Mcq

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