<PRE><B>Question 406776</B>
There are nine finalists in a certain competition.In how many ways can the judges choose four of them to be awarded with prize if
a)there are first prize,second prize,third prize and fourth prize,
Ans: 9P4 = 9*8*7*6*5
----------------------------

b)there are two first prizes and two second prizes
9C2*7C2 = (9*8/1*2)(7*6/1*2)
---------------------------------

c)there are first prize and three second prizes
Ans: 9*8C3 = 9*8*7*6/1*2*3 = 9*8*7
============================================
Cheers,
Stan H.
=============</PRE>