a) A baseball team has 15 players. How many 9-player batting orders are possible? b) From a cooler with 8 cans of different kinds of soda, 3 are selected for 3 people. In how many ways can this be done? c) A group of 4 students is to be selected from a group of 10 students to take part in a class in cell biology. In how many ways can this be done? d) From a group of 15 smokers and 21 nonsmokers, a research wants to randomly select 7 smokers and 6 nonsmokers for a study. In how many ways can this study group be selected