Hi I'm stuck on a question, and sadly my coursebook is actually missing the pages I need due to a printing error.

The question reads-

Find the sum of the infinite series:

(5/6)^3 - (5/6)^4 + (5/6)^5 - (5/6) ^ 6 ...

Any help would be great.

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- May 11th 2010, 01:04 PMedmoSum of an infinite series
Hi I'm stuck on a question, and sadly my coursebook is actually missing the pages I need due to a printing error.

The question reads-

Find the sum of the infinite series:

(5/6)^3 - (5/6)^4 + (5/6)^5 - (5/6) ^ 6 ...

Any help would be great. - May 11th 2010, 01:43 PMdwsmith
- May 11th 2010, 01:48 PMchisigma
Starting from the series...

... and setting...

(2)

... we arrive at the equation...

(3)

... the solution of which is ...

Kind regards

- May 11th 2010, 02:09 PMArchie Meade