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Geometric Sequences
medium
0:00.0
What is
a
1
a_1
a
1
for
a
n
=
5
⋅
4
n
−
1
a_n = 5 \cdot 4^{n-1}
a
n
=
5
⋅
4
n
−
1
?
A
5
5
5
B
4
4
4
C
20
20
20
D
1
1
1
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