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posted by deborah Friday, July 22, 2011 at 8:13pm.
in a certain geometric sequence, the third term is 8 and the sixth term is 125. what is the first term?
ar^2 = 8 ar^5 = 125 divide the 2nd by the 1st .... r^3 = 128/8 r = 5/2 back into the first a(25/4) = 8 etc.
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