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What is the simplified form of \(\frac{(n+3)!}{(n+1)!}-\frac{(n+2)!}{n!}\)?

Answer and explanation

Correct answer: \(2(n+2)\)

Since \((n+3)!=(n+3)(n+2)(n+1)!\), \(\frac{(n+3)!}{(n+1)!}=(n+3)(n+2)\). Similarly, \(\frac{(n+2)!}{n!}=(n+2)(n+1)\). Hence, the expression becomes \((n+2)[(n+3)-(n+1)]=2(n+2)\). The option \(n+2\) incorrectly omits the difference factor 2. Exam tip: In factorial fractions, expand only until the denominator factorial and then cancel common factors.

Related tags

Factorial NotationPermutations And CombinationsFactorial SimplificationAlgebraic ExpressionsClass 11 MathematicsMathematicsClass 11 Mcq

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