Question

sum of 4 term their product is 105​

Answer 1

let the four terms be
(a+d)(a)(a-d)(a-2d)

(a+d)×(a)×(a-d)×(a-2d)=105
(a+d)×(a-d)=105/(a)(a-2d)
a²-d²=105/a²-2ad
a²-2ad( a²-d²)=105