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 any one station to any other.

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Solution

Including $x$ and $y$ there are $12$ stations From any one station to any other we need $11$ different types of tickets Since there are $12$ stations the different tickets possible are $(12) (11) = 132$

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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 any one station to any other.

Including x and y there are 12 stations From any one station to any other we need 11 different types of tickets Since there are 12 stations the different tickets possible are (12)(11)=132

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 any one station to any other.

Including $x$ and $y$ there are $12$ stations From any one station to any other we need $11$ different types of tickets Since there are $12$ stations the different tickets possible are $(12) (11) = 132$