Three Dimensional Geometry

If the lines \(\frac{2 x-4}{\lambda}=\frac{y-1}{2}=\frac{z-3}{1}\) and \(\frac{x-1}{1}=\frac{3 y-1}{\lambda}=\frac{z-2}{1}\) are perpendicular to each other, then \(\lambda=\)