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What is the value of [15!/(12!·3!)] × 2/13?

Answer and explanation

Correct answer: 70

First simplify the factorial quotient by cancellation: 15!/(12!·3!) = (13 × 14 × 15)/6 = 2730/6 = 455. Now multiply by 2/13: 455 × 2/13 = (35 × 13) × 2/13 = 70. Therefore option D is correct. The original option list did not contain the mathematically correct value 70, so option D has been corrected from 40 to 70 to preserve one unambiguous answer. Options A, B, and C are not obtained from the stated expression; they may result from incomplete cancellation or an arithmetic mistake. The factorial identity and cancellation are the governing concepts.

Related tags

Factorial NotationBinomial CoefficientSimplificationPermutations And CombinationsMathematicsClass 11 Mcq

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