Mathematics, 18.08.2021 17:10 wirchakethan23

Evaluate the sum of geometric series below: $\displaystyle \large{ \sum_{k = 1}^n (4 \cdot {3}^{k} - {2}^{k + 1}) }$
Please also show your work too. Thank you!

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Evaluate the sum of geometric series below:
Please also show your work too. Thank you!...