Question

I don't understand this limit question, please help!
Limit(n approaches infinity) (1+2+3+......+n)/5n^2

Answer 1

do we know a formula for the sum of the number 1 to n ?

Answer 2

n(n+1)
-----
2
-----------
5 n^2


n(n+1)
-----------
10 n^2

should be simple from that

Answer 3

And the answer is 1/10. Thanks a lot!!! :D

Answer 4

yep :)

Answer 5

@Mathstudent97 : do u have any problem ?

Answer 6

No, thanks. I got it now :)

Answer 7

OK !