Question: write regular expressions for the following languages. 1. The set of string over alphabet {a,b,c} containing at least one a and at most one b.

write regular expressions for the following languages.

1. The set of string over alphabet {a,b,c} containing at least one a and at most one b.

2. The set of string over alphabet {a,b,c} containing at least one a or at most two b.

3. The set of binary strings not containing 111 as substring

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