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Geometric Sequences
hard
0:00.0
If
a
n
=
(
−
1
)
n
−
1
a_n = (-1)^{n-1}
a
n
=
(
−
1
)
n
−
1
, find
a
3
a_3
a
3
.
A
1
1
1
B
−
1
-1
−
1
C
0
0
0
D
None
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