If the sum of the first $m$ terms of an arithmetic series is $n$ and the sum of the first $n$ terms is $m$, the sum of t

Question

If the sum of the first $m$ terms of an arithmetic series is $n$ and the sum of the first $n$ terms is $m$, the sum of the first $(m + n)$ terms is —

Accepted Answer

$-(m + n)$

Answer

$m + n$

Answer

$0$

Answer

$mn$

If the sum of the first mmm terms of an arithmetic series is nnn and the sum of the first nnn terms is mmm, the sum of the first (m+n)(m + n)(m+n) terms is —