Find the sum of the following APs:

2, 7, 12, …., to 10 terms.

In the above series

First term (a) = 2

Common different (d) = n₂ – n₁ = 7 – 2 = 5

No. Of terms (n) = 10

The sum of the series is given by S_n = [ 2a + (n-1) d]

= [ 2×2 + (10-1)5]

= 245