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July 5, 2015

Homework Help: math

Posted by s on Monday, November 17, 2008 at 10:27pm.

determine the difference between the sum of the infinite geometric series 18-6+2-2/3...and the sum of the first 6 terms of the series (round to 3 decimal places)

first i did
S=18/ (1+1/3)= 13 1/2
Sn= 18(1+(1/3)^6)
_____________
1 + 1/3

= 13 14/27

13 1/2 - 13 14/27 = -1/54

what did i do wrong?

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