Nine people Ann Ben Cal Dot Ed Fran Gail Hal and Ida are in

Nine people (Ann, Ben, Cal, Dot, Ed, Fran, Gail, Hal, and Ida) are in a room. Five of them stand in a row for a picture. In how many ways can this be done if Dot is on the left end and Ed is on the right end?

Solution

Answer: P(7,3)

Total 9 people and Five of them stand in a row for a picture. So (9 - 5 = 7)

Probability: 7! / (7 - 3!)

7! = 5040

4! = 24

Now: 7! / (7 - 3!) = 210