How to derieve the formula for sum of series

I'm able to analyze and solve the equation till i get some specific series like T(n)=1+2+3+...n and other type of series but i'm unable to know how to determine the formula for the series derieved like sum of 1st n natural numbers is said to be n(n-1)/2 so how to derieve formula's for any series

Sashi Kumar Singh @sashisingh
4 Jul 2017 04:24 am