In
a network of railways, a small island has 15 stations. Find the number of
different tickets to be printed for each class, if every station must have
tickets for the other station.
Answer:
Station number 1 will have 14 tickets.
Station number 2 will have 13 tickets and so on. Therefore the total number of
tickets = 14 + 13 + 12 ........1 = 14 x 15 / 2 = 105
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