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Question

Which of the problems were not answered when the turing machine was invented?

a.

Does a machine exists that can determine whether any arbitrary machine on its tape is circular.

b.

Does a machine exists that can determine whether any arbitrary machine on its tape is ever prints a symbol

c.

Hilbert Entscheidungs problem

d.

None of the mentioned

Answer: (d).None of the mentioned

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Q. Which of the problems were not answered when the turing machine was invented?

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