A clinical test on humans of a new drug is normally done in three phases. Phase I is conducted with a relatively small number of healthy volunteers. For example, a phase I test of a specic drug involved only 9 subjects. Assume that we want to treat 9 healthy humans with this new drug and we have 11 suitable volunteers available. Complete parts (a) through (1:) below. a. If the subjects are selected and treated in sequence, so that the trial is discontinued if anyone displays adverse eflects, how many different sequential arrangements are possible if 9 people are selected from the 11 that are available? Choose the correct answer below. 0 A, 55 O 5. 19,958,400 0 c. 362,880 0 0. 39,916,800 b. If 9 subjects are selected from the 11 that are available, and the 9 selected subjects are all treated at the same time, how many different treatment groups are possible? There are different treatment groups possible. c. If 9 subjects are randomly selected and treated at the same time, what is the probability of selecting the 9 youngest subjects? P(selecting the 9 youngest subjects) = (Type an integer or a simplied fraction.)