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

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

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 8 railway stations along a railway line The number of ways in which a train can stop 3 stations no two of them are consecutive 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 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?