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GATE | GATE CS 2020 | Question 36
Which of the following languages are undecidable? Note that ⟨M⟩ indicates encoding of the Turing machine M.
- L1 = { ⟨M⟩ ∣ L(M)=∅ }
- L2 = { ⟨M,w,q⟩ ∣ M on input w reaches state q in exactly 100 steps }
- L3 = { ⟨M⟩ ∣ L(M) is not recursive }
- L4 = { ⟨M⟩ ∣ L(M) contains at least 21 members }
(A)
L1, L3, and L4 only
(B)
L1 and L3 only
(C)
L2 and L3 only
(D)
L2, L3, and L4 only
Answer
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