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Recursion
easy
0:00.0
If
a
n
=
2
a
n
−
1
a_n = 2a_{n-1}
a
n
=
2
a
n
−
1
and
a
2
=
8
a_2 = 8
a
2
=
8
, what is
a
1
a_1
a
1
?
A
2
B
4
C
6
D
8
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