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13 Mar 2010 21:32:49 IST

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if a,b,c and d are unit vectors and (a*b).(c*d)=1 and a.c=1/2 then a) a,b,c are non co planner b)

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if a,b,c and d are unit vectors and (a*b).(c*d)=1 and a.c=1/2 thena) a,b,c are non co plannerb) b,c,d are non co plannerc)b,d are non parelleld)ad are parellel and bc are parellel

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