Question

find the sum of even integers between 1 and 60

Answer 1

use a calculator and count it manualy.

Answer 2

i think it's around >1000

Answer 3

i mean <1000

Answer 4

(60^2 + 60 )/2

Answer 5

oops

Answer 6

i am wrong

Answer 7

all "even" would be (60^2 + 60) /4 ???

Answer 8

There are 30 even integers between 1 and 60.
The first and last pair add to 62.
So there are 15 pairs of integers who's sum is 62.
Therefore the total is 62 * 15 = 930

Answer 9

No, you are approaching this wrong.
Even between 1 and 60 are 2, 4, 6, ..., 60 so 2*(1, 2, 3, ..., 30) thus you get the sum 2*30*31/2 = 30*31 = 930

Answer 10

^ you are right, thanks for correction

Answer 11

this is an arithmetic sequence of the following form a = 2n from n = 1 to n = 30.
now use the formula for the arithmetic series: sum = (n/2) * (last term + first term)
so sum = (30/2) * (2+30) = 480

Answer 12

I think you mean 30/2 * (2+60)

Answer 13

sorry sum = (30/2) *(2 + 60)

Answer 14

930