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If (\binom{n}{6}=\binom{n}{10}), what will be the value of (n)?

Answer and explanation

Correct answer: 16

Use the identity \(\binom{n}{r}=\binom{n}{n-r}\). For \(\binom{n}{6}=\binom{n}{10}\), 6 and 10 must be complementary with respect to \(n\). Thus, \(n-6=10\), giving \(n=16\). For option 14, \(14-6=8\), so it does not give the stated equality. Exam tip: when \(\binom{n}{r}=\binom{n}{s}\) and \(r\ne s\), usually use \(r+s=n\).

Related tags

CombinationsBinomial CoefficientsPermutations And CombinationsClass 11Combinatorial IdentitiesMathematicsClass 11 Mcq

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