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Recursion Sequences - Problem 3

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

A recursive formula requires that you know the previous term in order to find the next one- that is, you need to know term n-1 in order to find term n. The formula itself will have " a sub n - 1." An explicit formula only has "a sub n." You can find any term without having to know any terms around it. If you're asked to determine whether a formula is recursive or explicit, look to see if you're given the first term and " a sub n - 1" (recursive) or just " a sub 1" (explicit.)

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