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OpenStudy (anonymous):
If the sixth term of a sequence is 128 and the common ratio is 2, then what is the first term?
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OpenStudy (anonymous):
general equation for geometric sequence: \[a _{n}=a _{1}*r ^{n-1}\] since we know the 6th term, we can plug it into our general equation \[(128)=a_{1}*(2)^{(6)-1}\] \[128=a _{1}*32\] solve for a1
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