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October 21, 2014

October 21, 2014

Posted by **azmeerahim** on Friday, January 18, 2013 at 2:49am.

0.05, 0.2, 0.8, ... Find the sum from the 5th term to the 8th term?

- Math -
**Steve**, Friday, January 18, 2013 at 4:51amThat would be S8 - S4

Since r = 4

.05(4^8-1) - .05(4^4-1) = 3264

- Math -
**azmeerahim**, Friday, January 25, 2013 at 12:44pma=0.05

r=4

S8=0.05(4^8-1)/3=1092.25

S4=0.05(4^4-1)/3=4.25

Sum from 5th term to 8th term is

S8-S4=1088

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