If $\overline{\mathrm{a}}, \overline{\mathrm{b}} ,\overline{\mathrm{c}}$  are non-coplanar vectors and $(\overline{\mathrm{a}} + 2\overline{\mathrm{b}} +\overline{\mathrm{c}})·(\overline{\mathrm{a}}-\overline{\mathrm{b}})\mathrm{x}(\overline{\mathrm{a}}- \overline{\mathrm{b}} - \overline{\mathrm{c}}) = \mathrm{\lambda }[\overline{\mathrm{a}} \overline{\mathrm{b}} \overline{\mathrm{c}}]$ then $\mathrm{\lambda }=$

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