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Mathematics, 30.08.2021 06:40 keke830

Find the sum Sn below: \displaystyle \large{S =1 \cdot 1 + 2 \cdot 5 + 3  \cdot  {5}^{2}  + 4 \cdot  {5}^{3}   + ... + n \cdot  {5}^{n - 1} }
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Find the sum Sn below:
Please show your work too. Thanks!​...
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