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

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Use the first 23 terms of the following arithmetic series for the problem below:

-18 - 20 - 22 - 24 - ...


What is the 23th term?		 a23 =
What is the sum of the first 23 terms? S23 =