The sequences are ..
Find the common difference by subtracting successive terms.
The distance between terms are not constant, Then this is not an arithmetic sequence.
This is not an arithmetic sequence.
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..![\"\"](\"/userfiles/image/Library/Algebra1/distance%20of%20the%20sequences.gif\")
![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/solution.JPG\")