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OpenStudy (anonymous):
which of the following is an arithmetric sequence? a. -2, 4, -6, 8 b. -8, -6, -4, 2 c. 2, 4, 8, 16
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OpenStudy (perl):
none of them, but b) might be a typo
OpenStudy (perl):
b) the first three terms are arithmetic, then the fourth term isnt
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