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:

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?

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 n stations on a railway line. The number of kinds of tickets printed (no return tickets) is 105. Find the number of stations

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 five stations on a railway line. What is the number of different journey tickets that are required for railway authorities?

There are n stations in a railway line.The number of way of choosing r stations such that no two of them are consecutive is