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The first differences are 5, 7, 9, 11, 13 and the second differences are 2,2,2,2 so the formula for the nth term is a quadratic.

tn = n2 + 2n - 2 (n = 1,2,3,...)

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โˆ™ 2009-11-02 21:32:55
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Q: What is the nth term formula for 1 6 13 22 33 46?
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