### Home > A2C > Chapter 13 > Lesson 13.1.3 > Problem 13-54

13-54.

Treat as the sum of two different sums.

Use the geometric summation formula on both and add the results.

Remember the prerequisites of the summation formula.

13-54.

Treat as the sum of two different sums.

Use the geometric summation formula on both and add the results.

Remember the prerequisites of the summation formula.