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A(1, - 1, 2) B(1, 0, 2) C(2, -2, 3) and ...

A(1, - 1, 2) B(1, 0, 2) C(2, -2, 3) and D(4, 2, 1) are the vertices of a tetrahedron then find the distance of the plane ABC from the vertex D.

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The correct Answer is:
`2sqrt2`
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