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Let a unit vector OP ^ makes angles      with the posit ive directions of the co - ordinate axes OX , OY , OZ respectively, where          2 , 0 . If OP ^ is perpendicular to the plane through points (1, 2, 3), (2, 3, 4) and (1, 5, 7), then which one of the following is true?

1.                   2 , 0 and 2 , 0
2.                    2 , 0 and , 2
3.                     , 2 and , 2
4.                    , 2 and 2 , 0

Correct answer:                     , 2 and , 2

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