solve with details

a) [3X4 marks] A committee of four people is to be selected from a group of ve males and six females. i. How many different committees can be selected? ii. How many committees can be selected that contain at least three females? iii. What is the probability of selecting two males and two females? b} [3 marks] A number is selected at random from the rst 400 positive integers, what is the probability that the number is not a multiple of 4 or not a multiple of 6