Q1 of 50 Page 32

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

1, 6, 11, …

a = 1


d = 6-1 = 5


Sn =


Here, n = 25


∴ S25 =


= 1525


Hence, the sum of first 5 terms for each sequence is found out.


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