If the angle θ between the line x + 1/1=y - 1/2=z - 2/2 and the plane2x - y + √λ x + 4 = 0 is such that sin θ =1/3, then the value of λ is

2.

If the plane 2ax - 3ay + 4az + 6 = 0 passes through the midpoint of the line joiningthe centres of the spheres x2+ y2+ z2+ 6x - 8y - 2z = 13and x2+ y2+ z2- 10x + 4y - 2z = 8, then a equals

3.

4.

The angle between the lines 2x = 3y = - z and 6x = - y = - 4z is