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Recursion
easy
0:00.0
If
a
n
=
2
a
n
−
1
+
1
a_n = 2a_{n-1} + 1
a
n
=
2
a
n
−
1
+
1
and
a
0
=
0
a_0 = 0
a
0
=
0
, what is
a
2
a_2
a
2
?
A
1
B
2
C
3
D
4
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