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Arithmetic Sequences - 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

An arithmetic mean is a term in a number sequence that has been omitted, and we are asked to find it. If you have two terms with one mean between them, then that mean will literally be the mean, or average of the terms on either side of it. We need to add those terms together and divide by two.

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