12 4. Given the following sets: 4= (2.4.6.8,10} B = (10.20.30; C = {1.3.5.7.20} Determine: (I mark each=4 marks) a) "(B) b AUB q B C d Identify any disjointed sets 5. A card is drawn from a standard deck and replaced. If this experiment is repeated 50 times. what is the probability that: a) exactly 20 of the cards are hearts (Hint: binomial event) (3 marks) b) at least 20 of the cards are hearts (Hint: use the approximation method once you have proved it is valid) (3 marks) 13