In the example above assume one newly available seat is in 1

In the example above, assume one newly available seat is in 1st class, one newly available seat is in Business class and one newly available seat is in Coach class. How many different ways can those three seats be filled by the 12 people on the waiting list if it matters which passenger sits in which newly available seat (i.e., order does matter)?

Solution

Total number ways is 12 C 3 =220 ways