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Which of the following problems is undecidable? A . Determining if a context - free grammar is ambiguous B . Checking if a string belongs

Which of the following problems is undecidable?

.

Determining if a context

-

free grammar is ambiguous

.

Checking if a string belongs to a regular language

.

Determining if a context

-

free grammar generates an empty language

.

Finding the shortest path in a graph

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