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Which of the following is a decidable problem? Note: CFG = Context Free Grammar; CNF: Chomsky Normal Form. Group of answer choices Does a CFG

Which of the following is a decidable problem? Note: CFG

=

Context Free Grammar; CNF: Chomsky Normal Form.

Group of answer choices

Does a CFG have its corresponding CNF

?

Is the complement of a CFG also context

-

free?

Is the intersection of three CFGs also context free?

Does a CFG define a language that contains all combinations of the symbols?

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