SOLUTION :Markownikoff's rule states that addition of halides to unsymmetrical alkenes takes place in such a MANNER that the negative part of the adduct attches itself to that carbon ATOM which CONTAINSLESSER number of hydrogen atoms. Here `C_3H_6(CH_3-CH=CH_2)` is an unsymmetrical alkene and the reagent is HBr, hence Markownikoff's rule is best applicable for this reaction