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The three vectors i+j, j+k, k+i taken tw...

The three vectors `i+j, j+k, k+i` taken two at a time form three planes. The three unit vectors drawn perpendicular to these three planes form a parallelopiped of volume.

A

`1/3`

B

`4`

C

`(3sqrt(3))/(4)`

D

`4/(3sqrt(3))`

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