At a university, a dean is going to select 6 volunteers to serve on a committee. There are 7 volunteers from the School of Journalism and 4 volunteers from the School of Public Policy. (If necessary, consult a list of formulas.) (a) In how many ways can the dean select 6 volunteers if the number of volunteers from the School of Public Policy must be less than or equal to 1? (b) In how many ways can the dean select 6 volunteers if the number of volunteers from the School of Public Policy must be greater than 1?