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Mathematics 18 Online
OpenStudy (anonymous):

Help!

OpenStudy (anonymous):

OpenStudy (anonymous):

Basically there's 4 more yellow things every time you go up a step. A1 = 1 A2 = 5 A3 = 9 So we just make a nice general formula: An = 1 + 4(n-1). And find the 12th term: A12 = 1 + 4(12-1) = 45

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