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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),a n dC(-1,1,2),` then angle between face `O A Ba n dA B C` will be a. `cos^(-1)((17)/(31))` b. `30^0` c. `90^0` d. `cos^(-1)((19)/(35))`

A

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

B

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

C

`30^(@)`

D

`90^(@)`

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The correct Answer is:
A
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