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If (^{n}C_{4}=^{n}C_{6}), what is the value of (n)?

Answer and explanation

Correct answer: 10

Use the symmetry property of combinations: \(^{n}C_r=^{n}C_{n-r}\). For \(^{n}C_4=^{n}C_6\), we need \(6=n-4\). Hence, \(n=10\). Option 8 is not correct because the symmetric counterpart of \(^{8}C_4\) is \(^{8}C_4\), not \(^{8}C_6\). Exam tip: When two \(nCr\) values with different lower indices are equal, their lower indices usually add up to \(n\).

Related tags

CombinationsNcrSymmetry PropertyBinomial CoefficientsClass 11 MathematicsPermutations And CombinationsMathematicsClass 11 Mcq

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