The dual of a Boolean expression is obtained by:
2023
The dual of a Boolean expression is obtained by:
- A.
Interchanging all 0s and 1s
- B.
Interchanging all 0s and 1s, all + and · signs
- C.
Interchanging all 0s and 1s, all + and · signs and complementing all the variables
- D.
More than one of the above
- E.
None of the above
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Correct answer: B
Rule for duality: replace every 0 by 1, every 1 by 0, every + (OR) by · (AND), and every · (AND) by + (OR).
Variables are not complemented while forming the dual. Complementing variables belongs to taking a complement, not to the dual operation.
Therefore, the correct option is: interchanging all 0s and 1s, and all + and · signs.