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Context-Free Grammars

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Question

In the context-free grammar below, S is the start symbol, a and b are terminals, and $ε$ denotes the empty string
$S \to a S a | b S b | a | b | ε$
Which of the following strings is NOT generated by grammar?

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Solution

L(G)= Set of all palindrome strings.
"baba" is not a palindrome string

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