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OpenStudy (anonymous):
Please help! For the geometric sequence with a_1=5 and a_5=405, find the 5th partial sum and the common ratio. r=?
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OpenStudy (anonymous):
25
OpenStudy (anonymous):
Can you please teach me how you got that answer?
OpenStudy (anonymous):
My options: a. 1/9 b. 1/3 c. 9 d. 3 :/
OpenStudy (anonymous):
d
OpenStudy (anonymous):
How?
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OpenStudy (anonymous):
you addd
OpenStudy (anonymous):
Add what? I'm confused. How did you start with 25 as your answer and then switch to 3?
OpenStudy (anonymous):
because u add the nubers equealing 3
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