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Geometric Sequences
medium
0:00.0
Given
S
n
=
2
(
3
n
−
1
)
S_n = 2(3^n - 1)
S
n
=
2
(
3
n
−
1
)
, what is
a
1
a_1
a
1
?
A
6
6
6
B
2
2
2
C
4
4
4
D
8
8
8
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