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If (^{n}C_{2}+^{n}C_{3}=^{n+1}C_{3}), this identity is based on which rule?

Answer and explanation

Correct answer: Pascal's rule

Pascal's rule is \(\binom{n}{r-1}+\binom{n}{r}=\binom{n+1}{r}\). On putting \(r=3\), we get \(\binom{n}{2}+\binom{n}{3}=\binom{n+1}{3}\). Hence, the correct answer is Pascal's rule. The multiplication rule is used to multiply the numbers of choices in successive independent steps, so it does not describe this additive identity. Exam tip: A sum of two consecutive binomial coefficients producing one coefficient with upper index increased by 1 indicates Pascal's rule.

Related tags

CombinationsPascal RuleBinomial CoefficientsCombinatorial IdentitiesClass 11 MathematicsPermutations And CombinationsMathematicsClass 11 Mcq

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