1.

A tetrahedron has vertices at 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 will be

Answer»

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

ANSWER :A


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