Question
If the vectors $a\hat{i} + \hat{j} + \hat{k}$, $\hat{i} + b\hat{j} + \hat{k}$, and $\hat{i} + \hat{j} + c\hat{k}$ are coplanar $(a \neq b, \, b \neq c, \, c \neq 1)$, then the value of $abc - (a + b + c) =$
If the vectors $a\hat{i} + \hat{j} + \hat{k}$, $\hat{i} + b\hat{j} + \hat{k}$, and $\hat{i} + \hat{j} + c\hat{k}$ are coplanar $(a \neq b, \, b \neq c, \, c \neq 1)$, then the value of $abc - (a + b + c) =$