(a) Suppose that a student is allowed to take zero, one, or two elective courses semester. Construct a tree diagram that shows that there are six ways in w a student can take exactly two electives in three semesters per
(b) Using the tree diagram of part (a), count the number of ways a student can take exactly five electives in three semesters Using three diagram of part (a), count the number of ways a student can take exactly four electives in three semesters. (c)