Forgot password? New user? Sign up

Existing user? Log in

$\large \dfrac{1}{1+2}+\dfrac{1}{1+2+3}+\cdots+\dfrac{1}{1+2+\cdots+20}$

If the value of the expression above is equal to $\dfrac mn$, where $m$ and $n$ are coprime positive integers, find the value of $m+n$.

Problem Loading...

Note Loading...

Set Loading...