Question

please give me full solution

Answer 1

Let no. S be a-3d a-d, a+d, a+3d
When we add all terms then we will get
4a=32
a=8
Given
a^2-9d^2/a^2-d^2=7/15
By solving and substituting value of a then we will get like this d^2=4
d=±2
If d=2,then
Terms are 2,6,10,14
If d=-2, then
Terms are 14,10,6,2