Write the following series using sigma notation:
11. 81 - 27 +9 -3 + .
...
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Mathematics, 04.06.2021 20:20, Nolife012603
Write the following series using sigma notation:
11. 81 - 27 +9 -3 + .
![answer](/tpl/images/cats/otvet.png)
Answers: 1
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