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Mathematics 7 Online
OpenStudy (goformit100):

Look at this series: 21, 9, 21, 11, 21, 13, 21, ... What number should come next? A. 14 B. 15 C. 21 D. 23

OpenStudy (goformit100):

@yrelhan4

OpenStudy (yrelhan4):

answer sarah.. quick. :P

OpenStudy (anonymous):

Everyother number stays the same (21) as the others go up by two. B) 15

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