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Combinatorics
hard
0:00.0
Find
n
n
n
if
P
(
n
,
4
)
=
20
t
i
m
e
s
P
(
n
,
2
)
P(n, 4) = 20 \\times P(n, 2)
P
(
n
,
4
)
=
20
t
im
es
P
(
n
,
2
)
.
A
5
B
7
C
9
D
8
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