1.

Let a = 2i + j + k, b = I + 2j - k and a unit vector c be coplanar. If c is perpendicular to a, then c =

Answer»

`(1)/(SQRT(2)) (- j + k)`
`(1)/(sqrt(3)) (-j - j - K)`
`(1)/(sqrt(5)) (j - 2J)`
`(1)/(sqrt(3)) (I - j - k)`

ANSWER :A


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