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
Sn =
Here, n = 25
∴ S25 =
= 1525
Hence, the sum of first 5 terms for each sequence is found out.
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