Question

1. Find the sum of the following APs:
(1) 2.7, 12. .... to 10 terms.
(iii) 0.6, 1.7.2.8.... to 100 terms.​

Answer 1

Explanation:

a=2

d= 5 and

n=10

s10=10/2 [2×2+(10-1)×5]

s10=5×[49]

=245