A study group is to be selected from a group of 1:1 students. The group consists of I" freshmen, 4 sophomores, and 3 juniors. a} In how ma ny ways can a group of If students be selected from this group? ti} If the study group is to consist of 1 freshmen, 1 sophomores, and 2 junior, how many:r different groups are possible? c} What is the probability that a group of 1' students will consist of 1 freshmen, all sophomores and 2 junior