Artificial intelligence
Two literals are complementary if _____________

They are identical and of equal sign
They are identical but of opposite sign
They are equal
They are unequal but of equal sign

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Artificial intelligence
A heuristic is a way of trying __________

All of the mentioned
To discover something or an idea embedded in a program
To compare two nodes in a search tree to see if one is better than the other is
To search and measure how far a node in a search tree seems to be from a goal

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