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August 23, 2014

August 23, 2014

Posted by **kaela** on Friday, January 4, 2013 at 2:35pm.

- math -
**Steve**, Friday, January 4, 2013 at 3:23pmSn = a(1-r^n)/(1-r), so

(1-r^4)/(1-r^8) = 1/17

r^4 = 1 or 16

1 is no good, so r=2

this will hold, regardless of the first term, T1. Letting T1=1, we have

1,2,4,8,16,32,64,128...

S4 = 15

S8 = 255

S4/S8 = 1/17

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