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

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Use the first 28 terms of the following arithmetic series for the problem below:

-1 + 2 + 5 + 8 + ...


What is the 28th term?		 a28 =
What is the sum of the first 28 terms? S28 =