### Home > PC3 > Chapter 13 > Lesson 13.2.3 > Problem 13-93

13-93.

Use summation notation to write each sum. Then evaluate the sum if it exists.

This is an arithmetic series with a first term of

and a common difference of .

How many terms are in the series? This information is needed to calculate the sum.This is a geometric series with a first term of

and a common ratio of .

How many terms are in the series? This information is needed to calculate the sum.This is an infinite geometric series. What is the common ratio? How does this affect the sum?