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The three vectors hat i+ hat j , hat j+...

The three vectors ` hat i+ hat j , hat j+ hat k , hat k+ hat i` taken two at a time from three planes. The three unit vectors drawn perpendicular to these three planes form a parallelepiped of vector: `1/3` (b) 4 (c) `(3sqrt(3))/4` (d) `4/(3sqrt(3))`

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