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Which problem can frequently occur in backward chaining algorithm?

(a) Repeated states

(b) Incompleteness

(c) Complexity

(d) Both Repeated states & Incompleteness

This question was addressed to me at a job interview.

This interesting question is from Backward Chaining topic in portion Logical Agents of Artificial Intelligence

Select the correct answer from above options

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Right choice is (d) Both Repeated states & Incompleteness

The explanation: If there is any loop in the chain means, It will lead to incompleteness and repeated states.

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