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A+  AB̅ + AB̅C + AB̅CD̅ simplifies to: 

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  1. A + B
  2. A̅ + B
  3. A.B̅  
  4. A

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Option 4 : A
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 Given expression: A+  AB̅ + AB̅C + AB̅CD̅ 

 =  A[1+B̅ + B̅C + B̅CD̅]

 =A  , Since 1+X=1

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