Question: Write a regular expression for each of the following languages over {a,b}: String of a's and b's that begin with a and end with b.

  1. Write a regular expression for each of the following languages over {a,b}:
    • String of a's and b's that begin with a and end with b.
    • Strings that have at least two a's.
    • Strings that have an even number of a's.
    • Strings that do not have two a's in a row.
    • Strings that do not end with the substring ab.

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