SOLUTION: Find the indicated values. (a) 9P2 (b) 9C2

Algebra ->  Permutations -> SOLUTION: Find the indicated values. (a) 9P2 (b) 9C2       Log On


   

Question 718031: Find the indicated values.
(a) 9P2

(b) 9C2
Answer by gingertea(7) About Me  (Show Source):
You can put this solution on YOUR website!
nPr=n! / (n-r)!
nCr=n!/(n-r)!r!
therefore,9P2= 9!/(9-2)!=72
9C2=9!/(9-2)!2!=36