1Nyone wid d reason??
Q1--In a network of railways, a small island has 15 stations.Find the number of different types of tickets to be printed for each class,if every station must have tickets for other station..
Answer--210
Q2--On a railway route there are 15 stations.Find the number of tickets required in order that it may be possible to book a passanger from every station to the other..
Answer--105
Why is the difference in answer..Can nyone figure out..
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3 Answers
62The reason is this..
Think of a person wanting to go from statino 1 to 15
if there is a ticket from 1 to 5 and then 5 to 15
then do we need to have that extra ticket from 1 to 15?
he can use both the tickets one from 1 to 5 and another from 5 to 15 to go from 1 to 15
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