Latest IIT-JEE Aptitude Question SOLUTION: If x, y, z are in A.P. and tan–1x, tan–1 y and tan–1 z are also in A.P., then - (1) 6x = 3y = 2z (2) 6x = 4y = 3z (3) x = y = z (4) 2x = 3y = 6z