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A+B+A'B'C

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A'B'C + [ A ]+ { B }     ---- Various parenthesis are used for easy understanding.

= A'B'C + [ A( B + B')  + A  ] +  { B + B ( A + A' ) }

= A'B'C + [ AB + AB'  + A  ] +  { B + AB  + A'B  }

= A'B'C + [ AB ( C + C' ) + AB'  + A  ] +  { B + AB  + A'B ( C + C ')  }

= A'B'C + [ ABC + ABC' + AB' ( C + C' )  + A  ] +  { B + AB  + A'BC + A'BC '  }

= A'B'C + [ ABC + ABC' + AB'C + AB'C'  + A  ] +  { B + AB  + A'BC + A'BC '  }

= A'B'C + AB'C + ABC + A'BC + [ ABC + ABC' + AB'C + AB'C'  + A  ] + { B + AB  + A'BC + A'BC '  }

= ( A' + A ) B'C + ( A' + A ) BC + [  A  ]  +  { B }

= B'C +  BC + [  A  ]  +  { B }

= ( B' + B )C + [  A  ]  +  { B }

= C + A + B

= A + B + C

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