1.

The position vectors of the vertices, A,B,C of a tetrahedron ABCD are hati+hatj+hatk,hati.3hati. The altitude from vertex D to opposite face ABC meets the median line AF of DeltaABCat the point E. IF AD=4 and volume of tetrahedron is (2sqrt2)/3 then barE is

Answer»

`3hati-hatj-hatk`
`-hati+3hatj+3hatk`
`3hati-3hatj-hatk`
`-hati+3hatj+hatk`

ANSWER :A::B


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