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Question

How many strings of length less than 4 contains the language described by the regular expression (x+y)*y(a+ab)*?

a.

7

b.

10

c.

12

d.

11

Posted under Compiler Design

Answer: (d).11

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Q. How many strings of length less than 4 contains the language described by the regular expression (x+y)*y(a+ab)*?