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What is the value of (\binom{12}{2}+\binom{12}{10})?

Answer and explanation

Correct answer: 132

Using the complementary property, \\(\binom{n}{r}=\binom{n}{n-r}\\). Hence, \\(\binom{12}{10}=\binom{12}{2}\\). Now, \\(\binom{12}{2}=\frac{12\times11}{2}=66\\), so the sum is \\(66+66=132\\). Option 66 is the value of only one term, so it is a close but incorrect distractor. Exam tip: \\(\binom{n}{r}\\) and \\(\binom{n}{n-r}\\) are always equal.

Related tags

CombinationsBinomial CoefficientsComplementary PropertyClass 11 MathematicsPermutations And CombinationsMathematicsClass 11 Mcq

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