There are 15 stations from New Delhi to Mumbai. How many first class tickets can be printed to travel from one station to any other station?

There are 18 stations between Hyderabad and Bangalore. How many second class tickets have to be printed, so that a passanger can travel from one station to any other station?

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 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.

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?

There are 50 stations on a railway line . How many different kinds of single 1st class tickets must be printed so as to enable a passenger to go from one station to another

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 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 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