We use cookies to personalise content and advertisements and to analyse access to our website. Furthermore, our partners for online advertising receive pseudonymised information about your use of our website. cookie policy and privacy policy.
 
+0  
 
0
696
1
avatar
(n+2)!/((n+1)!)
 22 апр. 2015 г.
 #1
avatar+249 
0

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.

3 Пользователи на сайте