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OpenStudy (anonymous):
Find an explicit rule for the nth term of the sequence. -3, -15, -75, -375, ...
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OpenStudy (anonymous):
do you have the geometric series equation handy?
OpenStudy (anonymous):
Not at the moment, but I'm looking for it!
OpenStudy (anonymous):
an = a1r n-1
OpenStudy (blurbendy):
so you need to find what "r" is. it's basically just the common ration between these numbers.
OpenStudy (anonymous):
How do I find the ratio?
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OpenStudy (ankit042):
divide the two terms of series to find ratio
OpenStudy (anonymous):
the ratio is a_2 / a_1
OpenStudy (anonymous):
Okay so 5
OpenStudy (anonymous):
ya, so you know the equation, just plug in a_1 and r into it and leave it as an equation for you answer
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