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Geometric Sequences
easy
0:00.0
Find
a
2
a_2
a
2
if
a
1
=
5
,
r
=
−
1
a_1=5, r=-1
a
1
=
5
,
r
=
−
1
.
A
−
5
-5
−
5
B
5
5
5
C
0
0
0
D
−
1
-1
−
1
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