Please help me do discrete mathematics, by including mathematical formulas for counting techniques

In how many ways can a photographer at a wedding arrange 6 people in arow from a group of 10 people, where the bride and the groom are among these 10 people, if a) the bride must be in the picture? b) both the bride and groom must be in the picture? c) exactly one of the bride and the groom is in the picture? In how many ways can a photographer at a wedding arrange 6 people in arow from a group of 10 people, where the bride and the groom are among these 10 people, if a) the bride must be in the picture? b) both the bride and groom must be in the picture? c) exactly one of the bride and the groom is in the picture