1.

A unit vector coplanar with I + j + 3k and I + 3j + k and perpendicular to I + j + k is

Answer»

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

Answer :C


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