If x, y, z are in A.P. and `t a n^(-1)x ,""t a n^(-1)y""a n d""t a n^(-1)z` are also in A.P., then (1) `2x""=""3y""=""6z` (2) `6x""=""3y""=""2z` (3) `6x""=""4y""=""3z` (4) `x""=""y""=""z`

If x,y , z are in A.P then (x-y)/(y-z) is equal to _________-

The equation of the plane containing the line 2x-5y""+""z""=""3;""x""+""y""+""4z""=""5 , and parallel to the plane, x""+""3y""+""6z""=""1 , is : (1) 2x""+""6y""+""12 z""=""13 (2) x""+""3y""+""6z""=-7 (3) x""+""3y""+""6z""=""7 (4) 2x""+""6y""+""12 z""=-13