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Which of the following regular expression corresponds to the language of all strings over the alphabet {a, b} that do not end with ab?
  • a)
    (a + b)* (aa + ba + bb)
  • b)
    (a + b)* (aa + ba + bb) + a + b + ∈
  • c)
    b* ab* a
  • d)
    b* aa b*
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
Which of the following regular expression corresponds to the language ...
Choice ‘a’ is incorrect since it does not include the string “a”, “b” and "∈” (all of which do not end with ab).
None of choices 'c' or ‘d ’ accept the string ‘a ’, So they can’t represent specified language.
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Most Upvoted Answer
Which of the following regular expression corresponds to the language ...
B)(a b)* (aa ba bb) (ε b)
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Which of the following regular expression corresponds to the language of all strings over the alphabet {a, b} that do not end with ab?a)(a + b)* (aa + ba + bb)b)(a + b)* (aa + ba + bb) + a + b + ∈c)b* ab* ad)b* aa b*Correct answer is option 'B'. Can you explain this answer?
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