1.

Valume of parallelpiped formed by vectors veca xx vecb, vecb xx vecc and vecc xx vecais 36 sq. units.

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SOLUTION :`[veca xx vecb vecb xx VECC vecc xx veca]=36`
`or [veca vecb vecc]=6`
` Rightarrow` volume of terthedron FORMED by vectors.
`veca,vecb and vecc is1/6 [ veca vecb vecc] =1`
`[veca +vecb vecb +vecc vecc +veca] =2 [veca vecb vecc] =12`
`veca-vecb,vecb-vecc and vecc-veca`are coplanar,
`Rightarrow [veca-vecb vecb -veccvecc-veca]=0`


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