19. Give regular expression for the following languages over the alphabet £= {a, b}. a) L1 = Ail sirings in which a, if it exists, appears tripled. This means that every clump of a's contains 3 d's, or 6 ď's, or 9 ď's, and so on. b) L2 = All strings that starts with even number of a's; followed by odd number of b's: and end with even number of d's.

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19. Give regular expression for the following languages over the alphabet E = {a, b}.
a) 1 = Ail sirings in which a, if it exists, appears tripled. This means that every
clump of a's contains 3 d's, or 6 d's, or 9 ď's, and so on.
b) L2 = All strings that starts with even number of a's; followed by odd number of
b's; and end with even number of a's.
dd lenath: OR all strings that starts
Transcribed Image Text:19. Give regular expression for the following languages over the alphabet E = {a, b}. a) 1 = Ail sirings in which a, if it exists, appears tripled. This means that every clump of a's contains 3 d's, or 6 d's, or 9 ď's, and so on. b) L2 = All strings that starts with even number of a's; followed by odd number of b's; and end with even number of a's. dd lenath: OR all strings that starts
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