Finding the dual of compound propositions

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Bashyboy
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The question is, "Find the dual of each of these compound propositions."

The propositions being: p∧¬q∧¬r, (p∧q∧r)∨s, and (p∨F)∧(q∨T)

I don't quite understand what they want me to do.
 

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Do you know what the "dual" of a proposition is?
 

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