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What is \( \frac{(3n+2)!}{(3n)!} \) equal to?

Answer and explanation

Correct answer: \((3n+2)(3n+1)\)

Write \((3n+2)!=(3n+2)(3n+1)(3n)!\). The factor \((3n)!\) cancels from the numerator and denominator, giving \(\frac{(3n+2)!}{(3n)!}=(3n+2)(3n+1)\). Option D incorrectly retains an extra factor of \(3n\). Exam tip: expand the larger factorial only up to the smaller factorial, then cancel common factors.

Related tags

Factorial NotationFactorial SimplificationPermutations And CombinationsAlgebraic ExpressionsClass 11 MathematicsMathematicsClass 11 Mcq

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