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OABC is a tetrahedron. The position vect...

OABC is a tetrahedron. The position vectors of A, B and C are `i, i+j and j+k`, respectively. O is origin. The height of the tetrahedron (taking ABC as base) is

A

`1/2`

B

`1/sqrt2`

C

`1/(2sqrt2)`

D

`sqrt2`

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