1.

For s Є (0+1)* let d(s) denote the decimal value of s(e.g.d(101)) = 5 Let L = {s Є (0+1)* d(s) mod 5=2 and d(s) mod 7 != 4} Which one of the following statements is true?

A. L is recursively enumerable, but not recursive
B. L is recursive, but not context-free
C. L is context-free, but not regular
D. L is regular
Answer» E.


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