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OpenStudy (anonymous):
Check My Answer Please? Write the formula for the geometric sequence. 7, 21, 63, 189… A. an=7∙3^n-1 B. an=189∙3^n-1 C. an=7∙3n D. an=189∙3n I believe the answer is D.
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OpenStudy (mathstudent55):
For n = 1, what do you get with D?
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