StudyDex
Search…
k
Home
My StudyDex
Past Papers
Search
A-Level
GCSE
IGCSE
Classes
Terms
© 2026 StudyDex Ltd
Calculate probability using permutations (#762)
Learn
Examples
Practice
Calculate probability using permutations (#762)
Use
P
(
n
,
r
)
=
n
!
(
n
−
r
)
!
P(n,r) = \frac{n!}{(n-r)!}
P
(
n
,
r
)
=
(
n
−
r
)!
n
!
for ordered selections.
