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Hello, I just have one question. Please explain so that I won't just 'have an answer' but an understanding so that I can practice these sort of problems on my own. Once again, thanks so much for all of your help and assistance .

 

1. What is the sum of the first 893 EVEN numbers? 

Guest Jun 25, 2018
 #1
avatar+87293 
+2

Note that the sum of  the first  n  positive integers  is just

 

n (n + 1)  / 2

 

So....the sum of the first   even positive integers  would  just be twice this  =  

 

(n) (n + 1)  / 2  *  2  =  ( n )  ( n + 1)

 

For instance....the sum of the first two positive even integers  is just

 

2 ( 2 + 1)  =  2  * 3  = 6

 

So....the sum of the first 893 positive even integers is just

 

893  ( 893 + 1)  =

 

893  * 894  =

 

798,342

 

 

cool cool cool

CPhill  Jun 25, 2018

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