Is the Sequence Arithmetic? No. Explanation: See solution.
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When a sequence is arithmetic, the difference between two consecutive terms is constant. Let's see if this is the case for the given sequence.
-5 + 10 ⟶ 5 +( - 10) ⟶ -5 + 10 ⟶ 5 ⟶ ...
As we can see, the difference between consecutive terms is not constant. Therefore, the sequence is not arithmetic.