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GATE | GATE CS Mock 2018 | Set 2 | Question 48

  • Last Updated : 08 Mar, 2018

What is the language generated by this regular expression ?

(b + ε ) (a + ab)* 

(A) Always starts with b
(B) Can have any number of ba and ab
(C) Can not have 2 b’s together.
(D) Starts and end with same symbol

Answer: (C)


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R.E. = b(a + ab)* + (a + ba)*
     = (b + ε ) (a + ab)* 


R.E. = (a + ba)* + (a + ba)*b
     = (a + ba)* (ε + b)

Both means ‘Can not have 2 b’s together’.
Option (C) is Correct.

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