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 12 stations on a certain railway line . How many different kinds of tickets of class II must be printed in order that a passenger may go from any one station to any other ?

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

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?

If there are 25 railway stations on a railway line, how many types of single second class tickets must be printed, so as to enable a passenger to travel from one station to another.

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:

If there are 30 Railway stations on a Railway line, how many number of single second class tickets must be printed so as to enable a passenger to travel from one station to another.

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 go from one station to another station is

There are 17 stations from Howrah to Bandel on the railway line . How many kinds of different single third class tickets must be printed so as to enable a passenger to travel from one station to another?

There are 13 stations on a certain railway line.How many kinds of different single third class tickets have to be printed in order that it may be possible to travel from any station to any other?