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A tetrahedron has vertices O(0,0,0),A(1,...

A tetrahedron has vertices `O(0,0,0),A(1,2,1)`,B(2,1,3)` and `C(-1,1,2)`, then angle between face `OAB` and `ABC` will be a. `cos^(-1)(17/31)` b. `30^@` c. `90^@` d. `cos^(-1)(19/30)`

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