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Which of the following denotes the set of all strings over the alphabet { a , b } that contain at least one a ?
Which of the following denotes the set of all strings over the alphabet {a, b} that contain at least one a?
| 1) | a*b*a* | |
| 2) | a(a+b)* | |
| 3) | (a+b)*a | |
| 4) | (a+b)*ab* | |
| 5) | b*ab* |
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Concepts of Database Management
Authors: Philip J. Pratt, Mary Z. Last
8th edition
1285427106, 978-1285427102
