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Mathematics, 01.09.2021 14:00 ayoismeisjjjjuan

Find the sum Sn below: \displaystyle  \large{S = n \cdot 1 + (n - 1) \cdot 3 + (n - 2) \cdot  {3}^{2}  + (n - 3) \cdot  {3}^{3}  + ... + 2 \cdot  {3}^{n - 2}  + 1 \cdot  {3}^{n - 1} }
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Find the sum Sn below:
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