Question

There are 15 stations on a Railway line. For this, how many different tickets of a class should be printed such that any person from any station can buy the ticket of other station of this line?

Answer 1

Total number of stations = 15

A person buys a ticket on a station then we can buy tickets of the remaining 14 stations.

Hence, a total number of methods of printing 14 tickets out of 15 tickets.

One ticket can be printed in 2 ways in this way total 14 tickets will be printed.

Hence, the total number of ways tickets be printed for 15 stations are = 15 × 14 = 210.