Question

There are 50 stations on a railway line.The number of different kinds of single 2nd class tickets must be printed so as to enable a passenger to travel from one station to another station is:

Answer 1

There are `50` stations and we have to print tickets from one station to another station.
So, total number of ways doing this will be `50_(P_2)`.
`:.` Required number of tickets to be printed ` = 50_(P_2) = (50!)/((50-2)!) = (50!)/(48!) = 50**49 = 2450`