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Geometric Sequences
medium
0:00.0
Find
a
1
a_1
a
1
if
a
n
=
2
n
+
1
a_n = 2^{n+1}
a
n
=
2
n
+
1
.
A
4
4
4
B
2
2
2
C
1
1
1
D
8
8
8
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