Find the sum Sn below:
Please show your work too. Thanks!...
![subject](/tpl/images/cats/mat.png)
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} }](/tpl/images/2451/7782/97e77.png)
Please show your work too. Thanks!
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