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

Answer and explanation

Correct answer: (n(n+2))

Direct answer: Option B, \\(n(n+2)\\). Rewrite both factorials using n!: \\( (n+1)!=(n+1)n!\\), and \\(n!=n(n-1)!\\). The numerator becomes \\( (n+1)!+n!=(n+1)n!+n!=n![(n+1)+1]=n!(n+2)\\). Dividing by \\( (n-1)!\\), and using \\(n!/(n-1)!=n\\), gives \\(n(n+2)\\). Option A, n^2, misses the extra 2n term. Option B matches the derived result. Option C, n(n+1), would come from incorrectly treating the numerator as only (n+1)!, ignoring n!. Option D, n+2, omits the factor n from the factorial ratio. The safest method is to take n! common before cancelling. This also requires the usual factorial domain where n is a positive integer.

Related tags

PermutationsCombinationsFactorialHard

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