Question

In how many ways can a fraternity of 20 guys select a president, vice president and treasury, assuming that the same person cannot hold more than one office? O 12,620 O 6,840

Answer 1

We can resolve the question using the next formula

`P(n,k)=(n!)/((n-k)!)`

where n = 20 , k=3

then we substitute the values

`P(20,3)=(20!)/((20-3)!)=20*19*18=6840`