Cong Cong, Tian Tian and Guoguo sit in a row and ask the photographer to take a group photo for them. How many kinds of seats are there?

According to the principle of permutation and combination, we can calculate the sitting method of three people by arranging everyone in different positions in turn. First of all, there are three options to determine the first position: Congcong, Tian Tian and Guoguo. Choose one of the remaining two positions as the second position, and choose one person from the remaining two to fill this position. Assign the last empty seat to the remaining members, * * * 3+2+ 1=6 different sitting postures.