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Let veca=hati+hatj+hatk,vecb=hati+4hatj-hatk and vec c =hati+hatj+2hatk. If vecS be a unit vector, then the magnitude of the vector (veca.vecS)(vecbxxvecc)+(vecb.vecS)(veccxxveca)+(vecc.vecS)(vecaxxvecb) is equal to

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Answer :C


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