Question

Find the sum of the following APs: $2,7,12,......,$ to $10$ terms

• A. 245
• B. 345
• C. 276
• D. 250

Answer 1

The correct option is A 245

$S=\frac{n}{2}(2a+d(n-1\left)\right)$

Here, $a=2,d=5$ and $n=10$

$Sum=\frac{10}{2}\left(2\right(2)+45)$

$=5\times 49=245$