UGC NET CSE | December 2005 | Part 2 | Question: 5

Question

Regular expression $a+b$ denotes the set :

• A. {$a$}
• B. {$\in, a, b$}
• C. {$a, b$}
• D. None of these

Answer 1

The given regular expresson generates strings a and b.not more,not less.

So option C is the answer

Answer 2

In a regular expression, positive closure $(+)$ sign represents choice or selection between alphabets/strings

$R=(a+b)$ means we have $2$ choice/strings,either $a$ or $b$.

 Option $(C)$ is correct.