Question

13. Find the sum of the following AP: 2, 7, 12... to 10 terms​

Answer 1

Djjxjjxjjdjdjdjjxjdjdjdjdjjdjdidi

Answer 2

Answer:

245

Step-by-step explanation:

a = 2

d = 7 - 2 = 5

an = a + (n-1)d

a10 = 2 + (10 -1)(5)

= 2 + (9)(5)

= 2 + 45

= 47

Sn =

$= \frac{n}{2} (2a + (n - 1)(d)) \\ = \frac{10}{2} (2(2) + (10 - 1)(5)) \\ = 5(4 + (9)(5)) \\ = 5(4 + 45) \\ = 5 \times 49 \\ = 245$

sum of the AP 2, 7, 12...... to 10 terms = 245

Hope you get your answer