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GATE | Sudo GATE 2020 Mock I (27 December 2019) | Question 57
Which of the following problems is decidable?
- I. Given a TM M and a string y, does M ever write the symbol # on its tape on input y?
- II. Given a context free grammar G over {a, b}, does G generate all the strings of the language {a, b}*of length ≤ 381?
- III. Given a TM M, are there infinitely many TMs M′accepting the same recursive enumerable set A = L(M)?
- IV. Given a TM M and a string y, does M accept y?
(A)
I and II
(B)
II and III
(C)
I, II and III
(D)
II and IV
Answer
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