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Recursion
easy
0:00.0
If
a
0
=
1
a_0 = 1
a
0
=
1
and
a
n
=
a
n
−
1
+
2
n
a_n = a_{n-1} + 2^n
a
n
=
a
n
−
1
+
2
n
, what is
a
2
a_2
a
2
?
A
7
B
3
C
5
D
9
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