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  also context-free? 3) If L is a regular language, then, is  also regular? 4) If L is a recursive language, then, is  also recursive

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Rashmi

Rashmi

how did the answer came

Archana

Archana

please anyone explain this answer

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