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For integers \(0\le r\le n\), which relation is always true between choosing \(r\) objects from \(n\) objects and choosing the objects left out?

Answer and explanation

Correct answer: \(\binom{n}{r}=\binom{n}{n-r}\)

Choosing \(r\) objects uniquely determines the \(n-r\) objects left out, so \(\binom{n}{r}=\binom{n}{n-r}\). In option B, the total number of available objects changes. Exam tip: use \(r\leftrightarrow n-r\) for complementary selections.

Related tags

CombinationsBinomial CoefficientsSymmetry PropertyComplementary SelectionClass 11 MathematicsPermutations And CombinationsMathematicsClass 11 Mcq

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