On a raiway there are 10 stations. The number of types of tickets required in order that it may be possible to book a passenger from every staton to every other is

On a railway there are 20 stations.The number of different tickets required in order that it may be possible to travel from every station to every station is

On a railway route there are 20 stations. What is the number of different tickets required in order that it may be possible to travel from every station to every other station

There are 10 railway stations between a station X and another station Y. Find the number of different tickets that must be printed so as to enable a passenger to travel from one station to any other.

In a network of railways,a small island has 15 stations.Find the number of different types of tickets to be printed for each class,if every stations must have tickets for other stations.

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

There are 15 stations on a certain railway line. How many different types of tickets must be printed so that a passenger can travel from any station to another in that line?