TOC REGULAR EXPRESSIONS

Question

WHICH ONE IS ODD ONE OUT     hOW TO SOLVE SUCH TYPE OF QUES?
1.(A* + B*A*)*
2.(A*B* + B*A*)*(A*B*)*
3.((AB)* + A*)*
4.(A+B)*A*B*A*B*

Comments

option (3)

((AB)*+A*)* is odd one, because rest all are genrating (A+B)*

it is easy see, in ((AB)*+A*)*  two or more consecutive B's can never come together.

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Added comment to answer for @joshi answer:$(3)$ is  also not generating $BABA$ pattern