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Mathematics 11 Online
OpenStudy (anonymous):

Which of the following is not an example of an arithmetic sequence? Fifty-one, fifty-two, fifty-three, fifty-four, fifty-five, and so on. There are 3 more chairs in each row of the theater. The number of songs on Garth's MP3 player doubled each week during two thousand nine. Eighty, sixty-five, fifty, thirty-five, twenty, and so on.

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