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Geometric Sequences
medium
0:00.0
Find
r
r
r
if
a
1
=
1
a_1=1
a
1
=
1
and
a
2
=
−
1
/
2
a_2=-1/2
a
2
=
−
1/2
.
A
−
0.5
-0.5
−
0.5
B
0.5
0.5
0.5
C
−
2
-2
−
2
D
1
1
1
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