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for any three vectors, veca, vecb and ve...

for any three vectors, `veca, vecb and vecc , (veca-vecb) . (vecb -vecc) xx (vecc -veca)` =

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Clearly, vectors `veca - vecb, vecb-vecc, vecc-veca` are coplanar,
`Rightarrow [ veca -vecb vecb- vecc vecc-veca] =0`
Therefore, the given statement is false.
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