Page 66 - Fixtures

@ @UQ@ @ÖïÐaínÜaì@Þî†bjnÜa@ @

:

.( n )n
.n −1

n −2 r

.n −r +1

P(n,r) = n(n − 1)(n − 2) (n − r + 1) = n !
(n − r)!

r =n

P(n,n) = n ! = n ! ()
0!
()
. ()

()

()

5! = 120 ()
.