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

Jul 2, 2020

#1
+111456
+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

Jul 2, 2020
#2
0

Welcome back CPhill!!!!!!!

Guest Jul 2, 2020
#3
+111456
+2

THX!!!!!

CPhill  Jul 2, 2020
#5
+1130
+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
+1130
+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
+744
-2

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

Jul 7, 2020
#7
+744
-2

i am too tho so lol!!!

Jul 7, 2020
edited by whymenotsmart  Jul 7, 2020