Q. 1 E

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

1, 6, 11, …

Answer :

a = 1

d = 6-1 = 5

S_{n} =

Here, n = 25

∴ S_{25} =

= 1525

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

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