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Geometric Sequences
medium
0:00.0
If
a
1
=
1
,
r
=
−
2
a_1=1, r=-2
a
1
=
1
,
r
=
−
2
, what is the sum of the first
3
3
3
terms?
A
−
1
-1
−
1
B
−
3
-3
−
3
C
3
3
3
D
1
1
1
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