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Question

Which one of the following is true?

a.

The resolvent of two Horn clauses is not a Horn clause

b.

The resolvent of two Horn clauses is a Horn clause

c.

If we resolve a negated goal G against a fact or rule A to get clause C then C has positive literal or non-null goal

d.

If we resolve a negated goal G against a fact or rule A to get clause C then C has positive literal or null goal

Answer: (b).The resolvent of two Horn clauses is a Horn clause

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