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Geometric Sequences
easy
0:00.0
If
a
1
=
1
a_1 = 1
a
1
=
1
and
a
2
=
−
1
/
2
a_2 = -1/2
a
2
=
−
1/2
, then
a
3
=
a_3 =
a
3
=
:
A
1/4
B
-1/4
C
0
D
1
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