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

Answer and explanation

Correct answer: 2

The governing concept is the consecutive-factorial identity k! = k(k−1)!. Assuming the factorials are defined, simplify each quotient separately. First, (n+2)!/(n+1)! = [(n+2)(n+1)!]/(n+1)! = n+2. Second, n!/(n−1)! = [n(n−1)!]/(n−1)! = n. Subtracting gives (n+2) − n = 2, so option B is correct. Option C is only the value of the second quotient, and option D is only the value of the first quotient. Option A incorrectly removes the added 2 instead of retaining it. The result is constant because the variable terms cancel, which is the important algebraic feature of the expression.

Related tags

Factorial NotationAlgebraic SimplificationIdentitiesClass 11Factorial NotationPermutations And CombinationsMathematicsClass 11 Mcq

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