GATE Computer Science (CS) 2012 Solved Paper

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Question : 34 of 65
 
Marks: +1, -0
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 LÌ…  also context-free?
3) If L is a regular language, then, is LÌ…  also regular?
4) If L is a recursive language, then, is LÌ…  also recursive? 
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