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Arithmetic Series - Problem 5

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Teacher/Instructor Alissa Fong
Alissa Fong

MA, Stanford University
Teaching in the San Francisco Bay Area

Alissa is currently a teacher in the San Francisco Bay Area and Brightstorm users love her clear, concise explanations of tough concepts

Since there is a formula for finding the sum of an arithmetic series, you can solve for any variable in that formula- including the first term. Set up your equation by filling in the given sum and final term, and then solve for the remaining variable that represents the first term.

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