May be you want to give it a try to this nice problem. Evaluate $\displaystyle \sum\limits_{m = 1}^\infty {\sum\limits_{n = 1}^\infty {\frac{1} {{m^2 n + mn^2 + 2mn}}} } .$ Cheers
Follow Math Help Forum on Facebook and Google+
Any takers? (It's not hard )
Sorry. It is old thread, But really I want to know how to solve this.
View Tag Cloud