1. The student council at Gotham College is made up of four freshmen, five sophomores, six juniors, and seven seniors. A yearbook photographer would like to line up three council members from each class for a picture. How many different pictures are possible if each group of classmates stands together?
2. George has three books by each of his five favorite authors. In how many ways can the books be placed on a shelf if books by the same author must be together?
3. In the quiz show It's Academic, three-person teams from three high schools are seated in a row, with each team seated together. How many different seating arrangements are possible?
4. An art gallery has four paintings, by each of three artists, hanging in a row, with paintings by the same artist grouped together. How many different arrangements are possible?