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Let X be defined as follows:

X: Given M an encoding of a Turing Machine. Does M halt on all inputs?

Which of the following is true?

  1. X is decidable
  2. X is undecidable but partially decidable
  3. X is undecidable and not even partially decidable
  4. X is not a decidable problem

Please answer with explaination.

in Theory of Computation by (14 points) | 3 views

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