Answer the questions below. (a) A certain committee consists of 15 people. From the committee, a president, a vice-president, X and a treasurer are to be chosen. In how many ways can these 3 offices be filled? Assume that a committee member can hold at most one of these offices. (b) An experiment involves 30 participants. From these, a group of 5 participants is to be tested under a special condition. How many groups of 5 participants are possible