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What is the simplified form of \(\frac{(n+4)!}{(n+1)!}\)?

Answer and explanation

Correct answer: \((n+4)(n+3)(n+2)\)

\((n+4)!=(n+4)(n+3)(n+2)(n+1)!\). Thus, \((n+1)!\) cancels from the numerator and denominator, leaving \((n+4)(n+3)(n+2)\). Option C uses \((n+1)\) in place of \((n+4)\), so it is incorrect. Exam tip: In factorial fractions, expand the larger factorial only until the denominator factorial appears, then cancel common factors.

Related tags

Factorial NotationPermutations And CombinationsClass 11Algebraic SimplificationFactorial FractionsMathematicsClass 11 Mcq

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