Algebra-1

Question Analysis
This question is about identifying a non-arithmetic sequence with a decreasing trend but varying differences, including a transition to negative terms. The main focus is on detecting that the differences between consecutive terms are not constant.

Key Concept Explanation
A sequence is not arithmetic if the differences between consecutive terms are not the same, even if it has a general decreasing trend and includes negative terms.

Step-by-Step Solution
Calculate the differences between consecutive terms:

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