If the straight lines $\mathrm{x}=1+\mathrm{s}, \mathrm{y}=-3-\mathrm{\lambda s}, \mathrm{z}=1+\mathrm{\lambda s}\text{ and }\mathrm{x}=\frac{\mathrm{t}}{2}, \mathrm{y}=1+\mathrm{t}, \mathrm{z}=2-\mathrm{t}$ with parameters s and t, respectively, are coplanar, then $\mathrm{\lambda }$ equals

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