Discussion Forum
Que.  The length of the shortest string NOT in the language (over Σ = {a, b}) of the following regular expression is ______________.
a*b*(ba)*a* 
a.  2 
b.  3 
c.  4 
d.  5 
Answer:3

Que.  The length of the shortest string NOT in the language (over Σ = {a, b}) of the following regular expression is ______________.
a*b*(ba)*a* 
a.  2 
b.  3 
c.  4 
d.  5 
Answer:3

Questions from Previous year GATE question papers
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