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What is the sum of all even number between 10 and 500 inclusive?

 Jul 2, 2020
 #1
avatar+112304 
+1

The sum of the first  n  even numbers   =    n ( n + 1)  

 

We have 250  even numbers  from  2 to 500  inclusive  

 

So....the sum of these  = 250 * 251   =  62750      (1)

 

The  sum  of the  even numbers from  2 to 8 inclusive  =  the sum of the first four even numbers =  4 * 5  = 20  (2)

 

So....the sum of the even numbers  between 10 and 500 inclusive  =  (1)  - (2)  =  

 

62750 -  20   =

 

62730

 

 

cool cool cool

 Jul 2, 2020
 #2
avatar
0

Welcome back CPhill!!!!!!!

Guest Jul 2, 2020
 #3
avatar+112304 
+2

THX!!!!!

 

cool cool cool

CPhill  Jul 2, 2020
 #5
avatar+1154 
+3

Um CPhill am I roght or wrong since we have different answers

jimkey17  Jul 6, 2020
edited by jimkey17  Jul 6, 2020
edited by jimkey17  Jul 6, 2020
 #4
avatar+1154 
+3

so we have (10+500)*(500-10/2+1)/4=510*496/4=63240

 Jul 6, 2020
edited by jimkey17  Jul 6, 2020
 #6
avatar+752 
-2

dunno, you were late responding to chris, so yeah....!!!!

 Jul 7, 2020
 #7
avatar+752 
-2

i am too tho so lol!!!

 Jul 7, 2020
edited by whymenotsmart  Jul 7, 2020

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