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What is the simplified form of (n+6)!/(n+3)! − (n+5)!/(n+2)!?

Answer and explanation

Correct answer: 3(n+5)(n+4)

The governing concept is expansion and cancellation of factorials. For the first quotient, (n+6)!/(n+3)! leaves the factors (n+6)(n+5)(n+4). For the second quotient, (n+5)!/(n+2)! leaves (n+5)(n+4)(n+3). Therefore the difference is (n+6)(n+5)(n+4)−(n+5)(n+4)(n+3). Factor out the common expression (n+5)(n+4), obtaining (n+5)(n+4)[(n+6)−(n+3)]. The bracket equals 3, so the result is 3(n+5)(n+4), making option B correct. Option A incorrectly uses a difference of 2, while C and D do not follow from the two remaining consecutive factors. The method avoids unnecessarily expanding the factorials into large products.

Related tags

Factorial SimplificationCommon FactorsPermutations And CombinationsMathematicsClass 11 McqFactorial Notation

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