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OpenStudy (anonymous):
When finding the sum of the arithmetic series 4 + 1 + -2 + -5 + -8 + -11, you will have a step of work that contains the number -3. Use complete sentences to describe how the -3 was calculated and what it means.
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OpenStudy (agent0smith):
-3 is the common difference between terms - notice that each term is found by subtracting 3 from the term before it. eg 4-3 = 1 1-3 = -2
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