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OpenStudy (anonymous):
Find the value of a1 for an infinite geometric series with s=9 and r=1/6
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OpenStudy (jango_in_dtown):
S=a1/(1-r) so from the given values 9=a1/(1-1/6) implies a1=15/2
OpenStudy (jango_in_dtown):
S is the sum, r the common ratio and a1 the 1st term
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