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The simplified value of C(15,7) + C(15,8) is equal to what?

Answer and explanation

Correct answer: C(16,8)

Apply Pascal’s identity, C(n,r) + C(n,r + 1) = C(n + 1,r + 1). Here n = 15 and r = 7, so C(15,7) + C(15,8) = C(16,8). Therefore option B is correct. The symmetry property also tells us that C(15,8) = C(15,7), but that observation alone does not identify the requested single binomial coefficient as directly as Pascal’s identity does. Option A has the wrong lower index. Option C combines unrelated parameters and is not the result of the identity. Option D includes only one of the two terms, not their sum. The adjacent lower indices 7 and 8 are exactly the pattern required by Pascal’s rule.

Related tags

Pascal IdentityBinomial CoefficientsSymmetryCombinationsPermutations And CombinationsMathematicsClass 11 Mcq

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