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If a group has n objects and r objects are selected, which identity represents the principle of complementary selection?

Answer and explanation

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

Choosing r objects is equivalent to deciding which n-r objects are left out; these choices correspond one-to-one. Hence \(\binom{n}{r}=\binom{n}{n-r}\). Option B is the permutation formula. Exam tip: for a complement-based choice, replace r with n-r.

Related tags

CombinationsComplementary SelectionBinomial CoefficientNcr IdentityPermutations And CombinationsMathematicsClass 11 Mcq

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