Question

Four out of 9 performers will be chosen to stand in a row on stage. How many ways can the 4 performers stand in a row?

362,880 ways

347,760 ways

15,120 ways

3024 ways

Answer 1

5*6*7*8*9 = 15120 ways...

Answer 2

The answer they want is calculated as follows:

\[nPr = \frac{ n! }{ (n-r)! }\]

n = 9, r = 4

the real answer is 12! read the question again, it is very badly written.