1.

A tetrahedron has vertices O(0,0,0), A(1,2,1), B(2,1,3) and C(-1,1,2). Then the angle between the faces OAB and ABC is

Answer»

`COS ^(-1) ((17)/(31)) `
`30^(@)`
`90^(@)`
`cos ^(-1) (( 19)/(35))`

Answer :D


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