### Home > APCALC > Chapter 9 > Lesson 9.2.1 > Problem9-57

9-57.

For each infinite series below, if the series converges, calculate the sum.

1. $16 − 4 + 1 −\frac { 1 } { 4 }+...$

1. $\frac { 1 } { 9 } + \frac { 1 } { 3 } + 1 + 3 + \ldots$

$S=\frac{a}{1-r}$