Question

In a a.p if the 12th term is -13 and the sum of its four terms is 24 find the sum of its first 10 terms.(plzzz answer)

Answer 1

Answer:

Explanation:

a12=-13

a+11d=-13         1

s4=24

use the sum formual and you will get

2a+3d=12          2

use 1 and 2

d=2

a=-35

now put these values in s10=sum formula

hope it helps you