Arithmetic Series Sum Formula Quizmaster
Review the Lesson | MATHguide homepage Updated November 29th, 2016

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Use the first 25 terms of the following arithmetic series for the problem below:

-15 - 10 - 5 + 0 + ...


What is the 25th term?		 a25 =
What is the sum of the first 25 terms? S25 =