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Recursion
easy
0:00.0
A sequence
a
n
=
3
a
n
−
1
a_n = 3a_{n-1}
a
n
=
3
a
n
−
1
with
a
0
=
1
a_0 = 1
a
0
=
1
. What is
a
2
a_2
a
2
?
A
3
B
6
C
9
D
12
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