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What is the simplified form of (n+6)!/(n+2)! − (n+5)!/(n+1)!?

Answer and explanation

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

Answer: 4(n+5)(n+4)(n+3), so option A is correct. Expand each factorial ratio only as far as its denominator. The first ratio is (n+6)!/(n+2)!=(n+6)(n+5)(n+4)(n+3). The second is (n+5)!/(n+1)!=(n+5)(n+4)(n+3)(n+2). The common factor is (n+5)(n+4)(n+3). Factoring it out leaves [(n+6)−(n+2)](n+5)(n+4)(n+3)=4(n+5)(n+4)(n+3). Option B uses the incorrect difference 3, and option D uses 2. Option C changes the common-factor structure and is not equivalent. The important habit is to align the products before subtracting.

Related tags

Factorial NotationFactorisationCommon FactorsAlgebraic SimplificationMathematicsClass 11 McqPermutations And Combinations

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