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If (\binom{n}{4}=\binom{n}{6}), what will be the value of (n)?

Answer and explanation

Correct answer: 10

Using the symmetry property of combinations, \(\binom{n}{r}=\binom{n}{n-r}\). Therefore, for \(\binom{n}{4}=\binom{n}{6}\), we need \(6=n-4\). Hence, \(n=10\). Option 9 is not correct because \(\binom{9}{4}\) and \(\binom{9}{6}=\binom{9}{3}\) are not equal. Exam tip: Two combinations with the same upper number are equal when their lower numbers add up to that upper number.

Related tags

CombinationsBinomial CoefficientsCombination SymmetryClass 11 MathematicsPermutations And CombinationsMathematicsClass 11 Mcq

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