The Sum 1/(1+(5/n))*5/n+1/(1+10/n))*5/n+1/(1+15/n)*5/n+.....1/(1+5n/n))*5/n

is a riemann sum for a definite integral

⌠b

⌡1f(x) dx

using a partition of the interval [1,b] into n subintervals of equal length,

Then the upper limit of integration must be: b =

and the integrand must be the function f(x) =