Questions
In a network of railways, a small island has 15 stations. The number of different types of tickets to be printed for each class, if every station must have tickets for other station, is
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a
230
b
210
c
340
d
None of these
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Correct option is B
For each pair of stations, two different types of tickets are required, Now, the number of selections of 2 stations from 15 stations=15×14.∴ Required number of types of tickets =15×14=210Similar Questions
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