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Mathematics 8 Online
OpenStudy (anonymous):

Which of the following is an arithmetic sequence? -2, 4, -6, 8, ... -8, -6, -4, -2, ... 2, 4, 8, 16, ..

OpenStudy (mathstudent55):

For each sequence, subtract each number from the next number. If all the differences are the same, then the sequence is an arithmetic sequence.

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