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[" 3.Let "vec a,vec b,vec c" be unit vec...

[" 3.Let "vec a,vec b,vec c" be unit vectors such that "],[vec a+vec b+vec c=vec 0" .Which one of the following is "],[" correct? "],[" (a) "vec a timesvec b=vec b timesvec c=vec c timesvec a=vec 0],[" (b) "vec a timesvec b=vec b timesvec c=vec c timesvec a!=vec 0],[" (c) "vec b timesvec b=vec b timesvec c=vec a timesvec c=vec 0]

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