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What makes a sequence an arithmetic sequence?
Not an arithmetic sequence.
When a sequence is arithmetic, the difference between two consecutive terms is constant. By examining our sequence, we can see that this is not the case. 3 + 3 ⟶ 6 + 6 ⟶ 12 + 12 ⟶ 24 ⟶ ... Therefore, the sequence is not arithmetic.