Question

The sum of first n, 2n, 3n terms of an AP. are x, y, z. Which of the following is correct?
(1) z = 3 (x - y)
(2) z= 3 (Y - x)
(3) x = 3 (z - y)
(4) y = 3 (z - x)
pls help me with the correct answer as soon as possible .​

Answer 1

let the series be 1,2,3,4,5,....

let n be 1

so x=1;y=3;z=6

substute in all options to get option 2 as correct