If a · b =1, b · c =2 and c · a =3, then the value of [ a ×( b × c ), b ×( c × a ), c ×( b × a )] is:

If $\displaystyle \vec{a} \cdot \vec{b}=1, \vec{b} \cdot \vec{c}=2$ and $\displaystyle \vec{c} \cdot \vec{a}=3$, then the value of $\displaystyle [\vec{a} \times(\vec{b} \times \vec{c}), \vec{b} \times(\vec{c} \times \vec{a}), \vec{c} \times(\vec{b} \times \vec{a})]$ is :