Question

in an AP given L=28,S=144,and there are total 9 terms.find a​

Answer 1

Answer

a will be 4.

Given

S = 144 , l = 28 , n = 9

Applying Formula for finding sum of n terms

Sn = n/2( a+l)

144 = 9/2( a +28)

144×2/9 = a+28

32 = a + 28

32 - 28 = a

a = 4

Answer 2

Answer:

I hope it is helpful............