Match the following                                                                       

Column - I		Column - II
A)	Number of ways selecting  8 balls out of an unlimited collection of Red , blue ,green and  yellow balls is	P)	${ }^{21}{C}_3$
B)	Number of 4 digit numbers having the sum of the digits equal to 9 is	Q)	Number of ways of distributing 12 apples to four people with each one getting at least one
C)	Number of ways of arranging 3 identical red balls 20 identical white balls in a row so that no two red balls are together is	R)	6
D)	Exponent of 3 in 17! is	S)	${ }^{11}{C}_3$