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Geometric Sequences
easy
0:00.0
Find
a
3
a_3
a
3
if
a
n
=
2
n
−
1
a_n = 2^{n-1}
a
n
=
2
n
−
1
.
A
4
4
4
B
2
2
2
C
8
8
8
D
1
1
1
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