2 question

Question 01: A bridge hand consists of any 13 cards selected from a 52-card deck without regard to order. There are (;) = 521/13139! different bridge hands, which works out to approxi- mately 635 billion. Since there are 13 cards in each suit, the number of hands consist- ing entirely of clubs and/or spades (no red cards) is (;;) = 261/13113! = 10,400,600. One of these (s) hands consists entirely of spades, and one consists entirely of clubs, so there are [(is) - 2] hands that consist entirely of clubs and spades with both suits rep- resented in the hand. Suppose a bridge hand is dealt from a well-shuffled deck (i.e., 13 cards are randomly selected from among the 52 possibilities) and let A = [ the hand consists entirely of spades and clubs with both suits represented) B = {the hand consists of exactly two suits} Question 02: A university warehouse has received a shipment of 25 printers, of which 10 are laser printers and 15 are inkjet models. If 6 of these 25 are selected at random to be checked by a particular technician, what is the probability that exactly 3 of those selected are laser printers (so that the other 3 are inkjets)