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Suppose a problem P1 reduces to a problem P2. Which of the following statements can we conclude to be TRUE based on the above? a)

Suppose a problem P1 reduces to a problem P2. Which of the following statements can we conclude to be TRUE based on the above?

a) If P2 is non-RE, then it must be that P1 is non-RE.

b) If P1 is non-RE, then it must be that P2 is RE.

c) If P1 is undecidable, then it must be that P2 is undecidable.

d) If P1 is undecidable, then it must be that P2 is decidable.

Please explain me what is the ans?

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