Solve this question in very easy method

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Fare for 1st km = Rs. 15
Fare for 2nd km = Rs. 15 + 8 = Rs 23
Fare for 3rd km = Rs. 23 + 8 = Rs 31

Here, each subsequent term is obtained by adding a fixed number (8) to the previous term.

Hence, the numbers involved make an arithmetic progression.

Hope this helps :)

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