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This is an arithmetic sequence with initial term a = 3 and common difference d = 2. Using the nth term formula for arithmetic sequences

an = a + (n - 1)d

we get an = 3 + (n - 1)(2) = 2n - 2 + 3 = 2n + 1.

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Q: What is the nth term for 3 5 7 9?
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