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

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

A

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

B

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

C

`30^(@)`

D

`90^(@)`

Text Solution

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The correct Answer is:
A
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