Find the common difference of the given AP. 10, 20, 30, 40, ...
Find the common difference (d) in the following APs respectively.
(i) 20, 40, 60, 80, 100,..
(ii) 5, 0, -5, -10, -15, ...
(iii) 2, 2, 2, 2, 2..
The sum of the first n terms of an AP whose first term is 8 and the common difference is 20 is equal to the sum of the first 2n terms of another AP, whose first term is - 30 and the common difference is 8. find n?