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A tetrahedron has vertices O (0,0,0), A(...

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

A

`cos^(-1)(19/35)`

B

`cos^(-1)(17/31)`

C

`30^(@)`

D

`90^(@)`

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