Q18 of 102 Page 394

Find the 28th term from the end of the AP 6, 9, 12, 15, 18, …., 102.

To Find 28th term from the end of the AP.


Given: The AP is 6, 9, 12, 15, 18, …., 102


a1 = 6, a2 = 9, d = 9–6 = 3 and l = 102


Formula Used: nth term from the end = l– (n–1)d


(Where lis last term and d is common difference of given AP)


By using nth term from the end = l– (n–1)d formula


28th term from the end = 102– 27d 102– 273 = 21


So 28th term from the end is equal to 21.


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