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What is the value of 14!/12! - 13!/11!?

Answer and explanation

Correct answer: 26

The governing concept is cancellation in factorial ratios. Since 14! = 14 × 13 × 12!, the first ratio is 14!/12! = 14 × 13 = 182. Likewise, 13! = 13 × 12 × 11!, so the second ratio is 13!/11! = 13 × 12 = 156. Subtracting gives 182 - 156 = 26. Therefore option B is correct. A useful check is to factor the difference: 14 × 13 - 13 × 12 = 13(14 - 12) = 13 × 2 = 26. Option A could arise from an incomplete subtraction, while options C and D do not agree with either the direct calculation or the factored form. The factorials should not be evaluated as enormous full products; only the uncancelled factors are needed.

Related tags

Factorial NotationFactorial CancellationArithmetic SimplificationPermutations And CombinationsMathematicsClass 11 Mcq

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