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Vector 1/3(2i-2j+k) is (A) a unit vect...

Vector `1/3(2i-2j+k)` is (A) a unit vector (B) makes an angle `pi//3` with vector `(2 hat i-4 hat j+3 hat k)` (C) parallel to vector `(- hat i+ hat j-1/2 hat k)` (D) perpendicular to vector `3 hat i+2 hat j-2 hat k`

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