Arithmetic Series Sum Formula Quizmaster
Review the Lesson | MATHguide homepage Updated June 18th, 2023

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Use the first 20 terms of the following arithmetic series for the problem below:

-10 - 8 - 6 - 4 - ...


What is the 20th term?		 a20 =
What is the sum of the first 20 terms? S20 =