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Recursion Sequences - Problem 3
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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Sample Problems (6)
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Problem 1 5,975 views
Given a1 = 1, a2 = 2, and an = 2an−1 + an−2Find the next three terms.
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Problem 3 895 views
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