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In which of the following situations, do...

In which of the following situations, does the list of numbers involved form an arithmetic progression, and why?
(i) The taxi fare after each km fare is 15 for the first km Rs.8 for each additional km.
(ii) The amount of air present in a cylinder when a vacuum pump removes 1/4 of 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.

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The correct Answer is:
(i) NO, (ii) No, (iii) Yes
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