Question: Construct a regular expression defining each of the following languages over the alphabet = { a b } : a) All words in which a

Construct a regular expression defining each of the following languages over the alphabet Construct a regular expression defining each of the following languages over the = { a b } :

a) All words in which a appears tripled, if at all. This means that every clump of a's contains 3 or 6 or 9 or 12 . . . a's.

b) All words that contain at least one of the strings alphabet = { a b } : a) All words in which, a appears tripled, if at all. This means that every clump of, a's contains 3 or 6 or 9 or 12 . . ., or a's. b) All words that contain at least one of the strings.

c) All strings that end in a double letter.

d) All strings that do not end in a double letter.

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