Q1 of 50 Page 32

Find the sum of the first 25 terms of each of the arithmetic sequences below.

11, 22, 33, …

a = 11 = first term


d = 22-11 = 11 = common difference


Sn =


Here, n = 25


∴ S25 =


= 25× 11× 13


= 3575


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