Question

2. In how many ways can five people line up at a bank teller's window?

Answer 1

5 x 4 x 3 x 2 x 1 = 120

The first person can move 5 positions since he is first. The second person can move 4 positions since one is already occupied, and so on...

Answer 2

The first person can move 5 positions since he is first. The second person can move 4 positions since one is already occupied, and so on...