The next two terms are 4x + x = 5x and 5x + x = 6x.
EXERCISE - 6.1
1. In which of the following situations, does the list of numbers involved form an arithmetic
progression, and why?
(i) The minimum taxi fare is ` 20 for the first km and there after ` 8 for each
additional km.
(ii) The amount of air present in a cylinder when a vacuum pump removes
1/4of the
air remaining in the cylinder at a time.
(iii) The cost of digging a well, after every metre of digging, when it costs ` 150 for
the first metre and rises by ` 50 for each subsequent metre.
(iv) The amount of money in the account every year, when `10000 is deposited at
compound interest at 8 % per annum.
2. Write first four terms of the AP, when the first term a and the common difference d are
given as follows:
