The sum of the first twelve terms of an arithmetic sequence of real numbers is 60. The first term is -6. What is the sum of the first twenty terms?

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- May 26th 2013, 05:01 PMEspionageHelp with Sequences and Series Problem
The sum of the first twelve terms of an arithmetic sequence of real numbers is 60. The first term is -6. What is the sum of the first twenty terms?

- May 26th 2013, 05:20 PMPlatoRe: Help with Sequences and Series Problem
- May 26th 2013, 05:49 PMEspionageRe: Help with Sequences and Series Problem
Thank you very much.