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[" 15.If "vec a,vec b,vec c" ane three v...

[" 15.If "vec a,vec b,vec c" ane three vectors having maguliude "1,2,3],[" respectively such that "a+b^(2)+vec c^(2)=0" ,then value of "|vec a*vec b+vec b*vec z+vec c*vec a|" is "]

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