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[" Dand "E" are respectively the points on the sides "AB" and "AC" of a triangle "ABC],[" such that "AD=3cm,BD=5cm,BC=12.8cm" and "DE|BC" .Then length of "DE],[" (in "cm" ) is "],[[" (a) "4.8cm," (b) "7.6cm," (c) "19.2cm," (d) "9Kcm]]

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