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Geometric Sequences
medium
0:00.0
In a geometric sequence
a
1
=
1
,
r
=
−
3
a_1=1, r=-3
a
1
=
1
,
r
=
−
3
. What is
a
3
a_3
a
3
?
A
3
3
3
B
9
9
9
C
−
3
-3
−
3
D
−
9
-9
−
9
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