### Home > INT3 > Chapter 12 > Lesson 12.1.3 > Problem12-43

12-43.

Calculate each sum.

Write out the first few and last term of the series.

1. $\displaystyle\sum _ { n = 1 } ^ { 8 } 3 ^ { n }$

This series is geometric.

1. $\displaystyle\sum _ { c = 1 } ^ { 16 } ( 3 c + 5 )$

This series is arithmetic.

$488$