If veca=hati+hatj+hatk and vecb=hati-hat...

If `veca=hati+hatj+hatk and vecb=hati-hatj` then the vector `(veca.hati)hati+(veca.hatj)hatj+(veca.hatk)hatk,(vecb.hati)hati+(vecb.hatj)hatj+(vecb.hatk)hatk and hati+hatj-2hatk` (A) are mutually perpendicular (B) are coplanasr (C) form a parallelopiped of volume 6 units (D) form as parallelopiped of volume 3 units

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