Three couples go to the movies and sit together in a row of six seats. In how many ways can these people arrange themselves if each couple sits together?

The total number of people are "6", but the arrangement should be according to "3" couples and as the couples are sitting with each other. Thus the total number of arrangements will be equal to 3x2x1 = 6

In terms of factorial, it can be written as 3! = 3x2x1 = 6