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
detailed solution
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
The number of integral solutions of is
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