Question 8

There are 10 stations on a railway line. The number of different journey tickets that are required by the authorities is

Solution

The number of different journey tickets that are required by the authorities = The number of selecting 2 stations × \times\ × 2 (For every pair stations say A and B, there are two tickets required A to B and B to A)
= $$^{10}C_2\times\ 2$$ = 90

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There are 10 stations on a railway line. The number of different journey tickets that are required by the authorities is

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