Assume the nth partial sum of the series $\displaystyle \sum^{\infty}_{n=1} a_n$ is the following: $\displaystyle s_n: 2-n3^{-n}$ a) Find $\displaystyle a_n (n>1)$ $\displaystyle a_n = ?$
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$\displaystyle a_n = s_n - s_{n-1}$
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