It is a small town railway station and there are 25
stations on that line. At each of the 25 stations the passengers can get
tickets for any of the other 24 stations.
How many different kinds of tickets do you think the booking
clerk has to keep?
Answer: At each station passengers can get tickets
for any of the other 24 stations and therefore, the number of tickets requited
is 25 ×24 = 600.
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