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Question

The simplified form of a Boolean equation $(A\overline{B} + A\overline{B}C + AC)(\overline{A}\overline{C} + \overline{B})$ is :

The correct answer is
$A\overline{B}$

Simplifying the Boolean Equation

We need to simplify the Boolean expression: $(A\overline{B} + A\overline{B}C + AC)(\overline{A}\overline{C} + \overline{B})$

Step 1: Simplify the first parenthesis

  • Original term: $A\overline{B} + A\overline{B}C + AC$
  • Apply the absorption law ($X + XY = X$) to the first two terms: $A\overline{B} + A\overline{B}C = A\overline{B}$.
  • The first parenthesis simplifies to: $A\overline{B} + AC$.

Step 2: Expand the expression

Now, substitute the simplified first parenthesis back into the original equation:

$(A\overline{B} + AC)(\overline{A}\overline{C} + \overline{B})$

Expand using the distributive property (FOIL):

$ (A\overline{B} \cdot \overline{A}\overline{C}) + (A\overline{B} \cdot \overline{B}) + (AC \cdot \overline{A}\overline{C}) + (AC \cdot \overline{B}) $

Step 3: Apply Boolean Laws

Simplify each term using Boolean algebra laws:

  • $A\overline{B} \cdot \overline{A}\overline{C} = (A \cdot \overline{A}) \overline{B} \overline{C} = 0 \cdot \overline{B} \overline{C} = 0$ (using $X \cdot \overline{X} = 0$)
  • $A\overline{B} \cdot \overline{B} = A (\overline{B} \cdot \overline{B}) = A\overline{B}$ (using $X \cdot X = X$)
  • $AC \cdot \overline{A}\overline{C} = (A \cdot \overline{A}) (C \cdot \overline{C}) = 0 \cdot 0 = 0$
  • $AC \cdot \overline{B} = A\overline{B}C

Step 4: Combine simplified terms

Add the simplified terms together:

$ 0 + A\overline{B} + 0 + A\overline{B}C $

This simplifies to:

$ A\overline{B} + A\overline{B}C $

Step 5: Final Simplification

Apply the absorption law ($X + XY = X$) again, where $X = A\overline{B}$:

$ A\overline{B} + (A\overline{B})C = A\overline{B} $

Conclusion

The simplified form of the Boolean equation is $A\overline{B}$.

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Important Questions from Minimization of Boolean Expression

  1. What is the value of \( \bar{F}\)?

    \(F = AB + \bar{C}\bar{D} + \bar{B}D\)

  2. Simplify the following Boolean expression.

    E(E + F) + DE + D(E + F)

  3. Which statement(s) is/are correct regarding the Boolean algebra?

    I. It facilitate the analysis and design of digital circuits.

    II. Expresses in algebraic form the input-output relationship of logic diagram.

  4. The input-output relationship of the binary variable for each gate can be represented in tabular form by a _______.

  5. What is the simplified expression for the Boolean function F(A, B, C, D) = Σ(0, 1, 2, 4, 5, 6, 8, 9, 10, 12, 13, 14) using the K - map method?

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