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veca=3hati-4hatj-4hatk,vec b=3hati+hatj+...

`veca=3hati-4hatj-4hatk,vec b=3hati+hatj+3hatk` and `vec c=hati-2hatj+hatk` are three edges of a rectangular parallelopiped, prove that the volume of the parallelopiped is 49 cu unit.

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