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A plane passes through the point (1,1,1)...

A plane passes through the point (1,1,1) and is parallel to the vectors `vec b = (1, 0, - 1) and vec c =(-1,1,0)`. If `pi` meets the axes in A, B, and C, find the volume of the tetrahedron OABC.

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The correct Answer is:
`4.5("unit")^(3)`
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