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OpenStudy (anonymous):
Which of the following is the formula for this geometric sequence? 1, -3, 9, -27,...
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OpenStudy (anonymous):
common ratio is -3 so \[a_n = a_1 r^{n-1}\] \[a_n = (1)(-3)^{n-1}\]
OpenStudy (anonymous):
Thank you :)
OpenStudy (anonymous):
glad to help
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