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Find the altitude of a parallelepiped...

Find the altitude of a parallelepiped whose three coterminous edtges are vectors ` vec A= hat i+ hat j+ hat k , vec B=2 hat i+4 hat j- hat ka n d vec C= hat i+ hat j+3 hat kw i t h vec Aa n d vec B` as the sides of the base of the parallepiped.

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