Question

If the 3rd an 11 term of an AP is 8 and respectively, find the sum of first 10 terms ​

Answer 1

Answer:

MARK ME AS BRANLIEST PLS

a+2d=8 and a+10d=20

⇒a=5,d= 3/2

∴S10 = 10/2. [2a+(10−1)d]

=5[2×5+9×3/2]

=117 1/2