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

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

Post by answerhappygod »

a) 7
b) 10
c) 12
d) 11
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