Question: Q3. A regular expression for the set {ab: n 23, mis odd (A). aaab. (B). aaabbb. (C). aaaa(bb)*b. (D). None of the above is right.

Q3. A regular expression for the set {ab": n 23, mis odd (A). aaab. (B). aaabbb. (C). aaaa"(bb)*b. (D). None of the above is right. Q4. A regular expression for the set ab": (n + m) is odd; ca (A). aaab (B). (aa)*(a+b)(bb). (C). a(aa)"bbb. (D). None of the above is right. Q5. Assume the following productions for a sample grammar: | abc 01|2|3|4|5617189 Which one of the following options is correct? (a) Identifiers consist of digits, letters, and lambda (b) Identifiers must begin with a letter (c) Identifiers must begin with a digit (d) None of the above

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