3860/CH2/EX2.25/Ex2_25.txt


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 f = bc + ac + ab 

 f = bca + bca' + ac + ab 

 f = bca + bca' + acb + acb' + abc + abc' 

 f = abc + a'bc + abc + ab'c + abc + abc' 

 f = a'bc + ab'c + abc' + abc