Posted by g on Thursday, December 9, 2010 at 2:16am.
sqroot(5*1215)=sqroot(6075)=77.9423
so you would have
5 m n o p 1215
that is..
a = 5 and t(6) = ar^5 = 1215
5r^5 = 1215
r^5 = 243
r = 3
so the 6 terms would be
5 15 45 135 405 1215
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