Re: ISI INTERVIEW PREP

Posted by Preet on Jul 03, 2012; 1:10pm
URL: http://discussion-forum.276.s1.nabble.com/ISI-INTERVIEW-PREP-tp7578819p7578995.html

@Anurag/all- Will we or not divide by 3! and 2!?

I had read tht if we have to selected all of then objects of which there are r of one type and s  of another type then the total number of ways this can be done is

(n!)/(r!)(s!)

anurag wrote

In a pack of cards there are 52 cards: cards of 13 denominations belonging to each of 4 suits (clubs, diamonds, hearts and spades). 5 cards
are drawn from a pack of 52 cards. What is the probability of getting
3 cards of one denomination and 2 cards of another denomination?

ans. wil it be ( 4C3 * 4C2 / 52C5) * 13 * 12
 * multiplication , C combination