Discussion
The dual of a Boolean expression is obtained by interchanging
Answer: C
The dual of a Boolean expression is obtained by interchanging Boolean sums and Boolean products and also interchanging 0's and 1's. For example, the dual of x(y + 0) is x + (y . 1).
Swapping only sums and products leaves out the constants, and swapping only the constants leaves the operators unchanged. The option that says 'or' also does not give the dual, since both swaps have to be made together.
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