Question

If n = 10, a = 2, d = 2 find S10
​

Answer 1

Answer:

$sn = \frac{n}{2} (2a + (n - 1)d$

$s10 = \frac{10}{2} (2 \times 2 + (10 - 1)2$

$= 5(4 + 9 \times 2)$

$= 5(4 + 18)$

$= 5 \times 22$

$= 110$

that's is your answer