$\overline{\mathrm{a}} =\overline{\mathrm{i}}- \overline{\mathrm{k}}, \overline{\mathrm{b}}=\mathrm{x}\overline{\mathrm{i}}+\overline{\mathrm{j}} + (1- \mathrm{x})\overline{\mathrm{k}}, \overline{\mathrm{c}} = \mathrm{y}\overline{\mathrm{i}} + \mathrm{x}\overline{\mathrm{j}} + (1 + \mathrm{x}- \mathrm{y})\overline{\mathrm{k}}$ then$[\overline{\mathrm{a}} \overline{\mathrm{b}} \overline{\mathrm{c}}]$ depends on
 

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