How many different kinds of tickets?
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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?
At each station passengers can get tickets for any of the other 24 stations and,therefore,the number of tickets required is 25 x 24 – 600.
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