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**thereddevils** Find the first three terms and the nth term of the series with the sum to n terms , $\displaystyle S_n$ , given by :

(1) $\displaystyle S_n=4n-\frac{1}{n}$

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

$\displaystyle 4+\frac{1}{n(n-1)},n>1$

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.