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What is the value of (\binom{13}{6}-\binom{12}{6})?

Answer and explanation

Correct answer: 792

Using Pascal’s identity, \(\binom{n}{r}-\binom{n-1}{r}=\binom{n-1}{r-1}\). Hence, \(\binom{13}{6}-\binom{12}{6}=\binom{12}{5}=792\). The value 924 is \(\binom{12}{6}\) itself, not the required difference. Exam tip: simplify such differences directly with Pascal’s identity instead of evaluating both combinations separately.

Related tags

CombinationsPascal IdentityBinomial CoefficientsClass 11Permutations And CombinationsMathematicsClass 11 Mcq

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