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Recursion
easy
0:00.0
If
a
n
=
a
n
−
1
+
n
a_n = a_{n-1} + n
a
n
=
a
n
−
1
+
n
and
a
0
=
0
a_0 = 0
a
0
=
0
, what is
a
3
a_3
a
3
?
A
3
B
6
C
5
D
4
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