1
GATE CSE 2012
MCQ (Single Correct Answer)
+1
-0.3
Which of the following problems are decidable?
$$1.$$ Does a given program ever produce an output?
$$2.$$ If L is a context-free language, then, is $$\overline L $$ also context-free?
$$3.$$ If L is a regular language, then, is $$\overline L $$ also regular?
$$4.$$ If L is a recursive language, then, is $$\overline L $$ also recursive?
A
$$1, 2,3,4$$
B
$$1,2$$
C
$$2,3,4$$
D
$$3,4$$
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