In: Statistics and Probability
6) A student committee has 15 members, including 7 from grade 12. In how many ways can a 4 member subcommittee be formed if a. There are no restrictions, b. The subcommittee must be only grade 12s, c. The subcommittee must have only 2 grade 12s., and d. The subcommittee can have no more than 2 grade 12s?