Forgot password? New user? Sign up

Existing user? Log in

$\large \sum_{n=1}^\infty \frac1{n(n+1)(n+2)(n+3)}$

If the series above equals to $\dfrac AB$ where $A,B$ are coprime positive integers, then what is the value of $A +B$?

Problem Loading...

Note Loading...

Set Loading...