B/A particular workshop produce 15 mechanical parts daily. The production of the first day include six bad parts and the other is good. If three parts are randomly selected at once, find: 1-Probability of one part is bad? 2-Probability of two part are bad? 3-Probability of three part is good? 4-Probability of at least one part is bad? 5-Probability of two parts is good? 6-Probability of at least one part is good