If a, b and c are three vectors, such that a + b + c=0, la|=1,Ibl=2,lc – InterviewSolution

1.	If a, b and c are three vectors, such that a + b + c=0, la\|=1,Ibl=2,lcl=2,then ab +bc+ca isa) -9/2b) 7c)1d) of these
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