If the ratio of the sum of the first 6 terms of a G.P to the sum of the first 3 terms of the G.P is 9 , what is the common ratio of the G.P ?
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Originally Posted by thereddevils If the ratio of the sum of the first 6 terms of a G.P to the sum of the first 3 terms of the G.P is 9 , what is the common ratio of the G.P ? and . It follows from that (nb: ). Therfore ....
Last edited by mr fantastic; Jan 20th 2009 at 03:01 AM. Reason: Transcription errror. Powers wrong by 1 - wine stain on napkin.
If you were to denote the first 6 terms of the geometric sequence as , then:
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