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Consider the following regular expression R = a*b* + b*a*. The number of equivalence classes of Σ* to represent a language which is equivalent to R is ____________

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I think answer should be 6 because number of equivalence class is equal to number of states of the finite automata including trap state which is 6 in this case. please comment if I am wrong.
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Deepalitrapti asked Jun 5, 2019
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How comes 3 states i got 4 states