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Geometric Sequences
easy
0:00.0
If
a
1
=
1
a_1 = 1
a
1
=
1
and
r
=
−
2
r = -2
r
=
−
2
, what is
a
4
a_4
a
4
?
A
−
8
-8
−
8
B
8
8
8
C
−
4
-4
−
4
D
16
16
16
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