IIT JEE 1983 Maths - MCQ Question 20

The volume of the parallelopiped whose sides are given by $\vec{OA}=2\hat{i}-3\hat{j}$ , $\vec{OB} =\hat i + \hat j - \hat k$ and $\vec{OC} = 3 \hat i - \hat k$ is $\text{\_\_\_\_\_\_\_\_\_\_}.$

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