Read the question in the picture .
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Hey mate!
Geometric series formula-
Sn= a(1-r^n)
-----------------
1-r
= 1[1-*3)^8]
----------------
1-3
= 1[1-6561]
------------------
-2
= -6560
---------------
- 2
= 3280............answer.............
Mark me as a brainlist dude ✌✌
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