In which of the following situation, the sequence of numbers formed will form an A.P.?(i) The cost of digging a well for the first metre is Rs. 150 and rises by Rs.20 for each succeeding metre.(ii)The mount of air present in the cylinder when a vacuum pump removes each time of their remaining in the cylinder.

In which of the following situation, the sequence of numbers formed will form an A.P.?

(i) The cost of digging a well for the first metre is Rs. 150 and rises by Rs.20 for each succeeding metre.
(ii)The mount of air present in the cylinder when a vacuum pump removes each time of their remaining in the cylinder.

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