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- February 18th 2009, 01:22 AM #1

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## SUm

Find the first three terms and the nth term of the series with the sum to n terms , , given by :

(1)

I know the first three terms . The answer given by the book for the nth term is :

My question is if that's the answer , why can't i get the first term which is 3 when i substitute n=1 into the formula .

And if it says n is greater than 1 , then there is no way to find the first term.

- February 18th 2009, 01:37 AM #2

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