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OpenStudy (anonymous):
What is the common difference in the arithmetic sequence 30, 27, 24, 21, 18, ...?
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OpenStudy (anonymous):
second term - first term = 27-30 = -3
OpenStudy (anonymous):
or 3rd term - 2nd term = 24-27 = -3
OpenStudy (anonymous):
or the n+1st term - nth term
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