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OpenStudy (anonymous):
Hi. ☺ the topic is Geometric Sequence find n if the A_1= 8 A_n= 1/4 S_n-=15(3/4)
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OpenStudy (anonymous):
So that S_n is supposed to be a mixed fraction it is: |dw:1381067133934:dw|
OpenStudy (anonymous):
@hartnn pls. help
hartnn (hartnn):
ok, di u know the formula for geometric seq ? the n'th term and the sum formula ?
OpenStudy (anonymous):
A_n= A_1(r)^n-1
OpenStudy (anonymous):
have to find n yet
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