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Formulae (1)
Probability & Combinatorics
Basic
Combinations
C
(
n
,
r
)
=
(
n
r
)
=
n
!
r
!
(
n
−
r
)
!
C(n,r) = \binom{n}{r} = \frac{n!}{r!(n-r)!}
C
(
n
,
r
)
=
(
r
n
)
=
r
!
(
n
−
r
)!
n
!
Number of unordered selections of r items from n.