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if veca,vecb,vecc are non coplanar and ...

if `veca,vecb,vecc ` are non coplanar and non zero vectors such that `vecbxxvecc=veca,vecaxxvecb=vecc and veccxxveca=vecb` then 3. `(a) |a|+|b|+|c| =0 (b) |a|+|b|+|c|=2 (c) |a|+|b|+|c| =3` (d) none of these`

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