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What is the simplified form of (n+6)!/(n+3)!?

Answer and explanation

Correct answer: (n+6)(n+5)(n+4)

Use the factorial expansion rule and stop when the denominator factorial appears. The numerator is (n+6)! = (n+6)(n+5)(n+4)(n+3)!. Dividing by (n+3)! cancels the final factorial completely, leaving (n+6)(n+5)(n+4). Therefore option B is correct. There are three steps between n+6 and n+3, so exactly three factors remain. Option A omits n+4, option C includes n+3 even though that factor belongs to the denominator factorial, and option D skips n+5. Assuming the factorials are defined, this method is valid and avoids calculating very large factorial values directly.

Related tags

Factorial NotationAlgebraic SimplificationCancellationPermutations And CombinationsMathematicsClass 11 Mcq

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