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(n+2)!/((n+1)!)
 22 апр. 2015 г.
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Easy to see if you substitute in numbers.

 

Let n = 2 , then :

(n+2)! = 4! = 4 x 3 x 2 x 1

(n+1)! = 3! =       3 x 2 x 1

 

As you can see, when dividing, the 3 x 2 x 1 will cancel out only leaving 4 on top, which is n+2.

 

Therefore (n+2)! / (n+1)! = n+2

 28 апр. 2015 г.

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