1.
Given the vectors u=2i^j^k^\vec{u} = 2\hat{i} - \hat{j} - \hat{k}, v=i^j^+2k^\vec{v} = \hat{i} - \hat{j} + 2\hat{k}, w=i^k^\vec{w} = \hat{i} - \hat{k}. If the volume of the parallelopiped having cu-c\vec{u}, v\vec{v} and cwc\vec{w} as concurrent edges is 88, then cc can be equal to