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n = 1, 2n = 2

n = 2, 2n = 4

n = 3, 2n = 6

2, 4, 6, ..., 2n where n = 1, 2, 3, ...

This is an arithmetic sequence, where the first term is 2 and the common difference is 2.

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Q: What is the first 3 terms if the nth term is 2n?
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