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Arithmetic Sequences - Problem 16

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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

The explicit formula of an arithmetic sequence tells us each term in the number list. To find the first term, we let n = 1, and to find the tenth term, we let n = 10, etc. Since we are asked to find the first four terms in particular, we plug in the values 1- 4 for n one at a time. There are shortcuts, too, that you'll get better at as you work more with arithmetic sequences.

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