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What is the value of (10!/(6!·4!) + 10!/(7!·3!))?

Answer and explanation

Correct answer: 330

The governing concept is factorial cancellation, with the expressions also recognizable as binomial coefficients. For the first term, 10!/(6!·4!) = (10·9·8·7)/(4·3·2·1) = 5040/24 = 210, which is 10 choose 4. For the second term, 10!/(7!·3!) = (10·9·8)/(3·2·1) = 720/6 = 120, which is 10 choose 3. Therefore the required sum is 210 + 120 = 330. Option D is correct. The other choices do not result from the exact factorial cancellations; a frequent mistake is to cancel 10! incorrectly or to use 4! in the second denominator instead of 3!. Evaluating each term separately avoids that error.

Related tags

Factorial NotationBinomial CoefficientsArithmetic SimplificationPermutations And CombinationsMathematicsClass 11 Mcq

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