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Calculate permutations (#715)
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Calculate permutations (#715)
Use
P
(
n
,
r
)
=
n
!
(
n
−
r
)
!
P(n,r) = \frac{n!}{(n-r)!}
P
(
n
,
r
)
=
(
n
−
r
)!
n
!
for ordered selections.