Question: find a regular expression and a BNF grammar for the respective language. Strings of as and bs in which the number of as is even.

find a regular expression and a BNF grammar for the respective language.

Strings of as and bs in which the number of as is even. Examples: b, aab, abbaaba, baa belong to the language, but a, ba, aaaabba, abbaa do not.

Strings of as and bs not containing two adjacent bs. Examples: b, aba, aabaaabaa, baaaba belong to the language, while aaabba, babb, babba, bb do not.

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