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Find the volume of tetrahedron formed by...

Find the volume of tetrahedron formed by the four planes `barr. (bari + barj) = 0 , barr. (barj + bark) = 0, barr. (bari + bark) = 0` and `barr. (bari + barj + bark) = 4.`

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The correct Answer is:
`128/3`
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