GATE | Gate IT 2007 | Question 70

Consider the regular expression R = (a + b)* (aa + bb) (a + b)*

Which deterministic finite automaton accepts the language represented by the regular expression R ?

(A) A
(B) B
(C) C
(D) D

Answer: (A)

Explanation: The equivalent NFA is as follows:

Table showing transitions between all states is as follows:

The transition table can be converted to the transition table for DFA:

Equivalent DFA for the above transition table is:
Hence option (A) is the required DFA for the given regular expression.

This solution is contributed by Yashika Arora

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