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2 Answers

Best answer
2 votes
2 votes
{(b*ab*ab*)*+b*}ab*

or

b*a{(b*ab*ab*)*+b*}

and for even no. of a = (b*ab*ab*)*+b*
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1 votes
assuming set of input symbols a,b ans is:b*a(b*ab*a)*b*