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Recursion
easy
0:00.0
If
a
n
=
a
n
−
1
+
n
−
1
a_n = a_{n-1} + n - 1
a
n
=
a
n
−
1
+
n
−
1
and
a
1
=
1
a_1 = 1
a
1
=
1
, what is
a
3
a_3
a
3
?
A
5
B
2
C
3
D
4
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