If $r = 1$, the infinite geometric series becomes $a + a + a + \ldots$ and its $n$-th partial sum is —

Question

Accepted Answer

$na$

Answer

$a$

Answer

$\dfrac{a}{n}$

Answer

$0$

If r=1r = 1r=1, the infinite geometric series becomes a+a+a+…a + a + a + \ldotsa+a+a+… and its nnn-th partial sum is —