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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
2
=
3
a_2 = 3
a
2
=
3
, what is
a
1
a_1
a
1
?
A
1
B
2
C
3
D
4
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