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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 2. `(a) |a|-|b|+|c| =4 (b) |a|-|b|+|c|=2/3 (c) |a|-|b|+|c| =1 (d)` none of these`

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