Arithmetic Sequence, 2, 4, 6, 8, 10,..., -9, -6, -3, 0, 3, ..., -21, -15, -9, -3, 3, ..., Not Arithmetic Sequence, 1, 3, 9, 27, 81,..., 2, 3, 5, 8, 13,...

Identify arithmetic sequences.

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