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2015-08-22T22:58:48+05:30

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I suppose    D is on AB  and  E is on AC.
    ABC  and  ADE  are similar triangles.  as the corresponding sides are parallel.
   
AD: DB = 2/4 =1/2
     =>  AD = AB /3    and  DB = 2 AB/3
AD / AB =  DE / BC 
             = 1/3

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