(Q20).In which of the following situations, does the list of numbers involved make an arithmetic progression, and why?

(i) The taxi fare after each km when the fare is Rs. 20 for the first km and rises by Rs. 8 for each additional km.

Fare for the first km = Rs. 20 = a

Fare for each km after the first = Rs. 8 = d

∴ The fares would be 20, , , , …….

The above list forms an A.P.

Since each term in the list, starting from the second can be obtained by adding ‘’ to its preceding term.