The Boolean expression $AB + AB' + A'C + AC$ is unaffected by the value of the…

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The Boolean expression $AB + AB' + A'C + AC$ is unaffected by the value of the Boolean variable:

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$AB + AB' = A$. So the expression becomes $A + A'C + AC = A + C$. Variable $B$ disappears ⇒ expression doesn’t depend on $B$.

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