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Recursion
easy
0:00.0
If
a
n
=
n
⋅
a
n
−
1
a_n = n \cdot a_{n-1}
a
n
=
n
⋅
a
n
−
1
and
a
1
=
1
a_1 = 1
a
1
=
1
, what is
a
3
a_3
a
3
?
A
3
B
12
C
6
D
9
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