Question: 1. Write regular expressions for the following sets: (a) All strings whose number of 0's is divisible by three. (b) All strings with no more

1. Write regular expressions for the following sets:

(a) All strings whose number of 0's is divisible by three.

(b) All strings with no more than three 0's.

(c) All strings with exactly one occurrence of the substring 111

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