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At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.

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pretty sure you have to use the partial sums formula for 8
do u know formulae for sum of finite and infinite terms in a geometric sequence??

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It's a geometric series a + ar + ar^2 + ... with a=1 and r = 3/2. Plug into the formula
http://en.wikipedia.org/wiki/Geometric_progression if u have finite geometric progession the sum is a1(q^n-1)/(q-1) if u have infinite geometric progresion the formula is a1/(1-r) where where a1 is the first therm r is the common ratio (u multyply all therms in progresion )

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