Question: Consider the context free grammar G with = {a, b} and rules S aSb | bSa | a | b. How many strings in L(G)

Consider the context free grammar G with = {a, b} and rules S aSb | bSa | a | b. How many strings in L(G) are of length less than or equal to 11? Hint: the answer involves the sum of a geometric progression.

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