1. Give a regular expression for the set of strings over {a, b, c} such that the sum of the number of a’s and the number of b’s is equal to 3.
Please find the Regular Expression below.

If you have any doubts please comment down here in the comment section below.
Please give me an upvote. I've spent a lot of time to solve your problem.
Happy Learning...
1. Give a regular expression for the set of strings over {a, b, c} such that...
Provide a regular expression for the set of strings over {a, b, c} such that the number of a’s equals the number of b’s and is less than or equal to 2.
Basic compiler question: Construct a regular expression for the regular language representing the set of strings where the number of b’s is a multiple of 3 and there can be any number of a’s. The alphabet is {a,b}
Give regular expressions for the following languages: (a) The language of all strings over {a,b} except the empty string. (b) The language of all strings over {a,b} that contain both bab and bba as substrings. (c)L k = {w ∈ {a,b} * | w contains a substring having 3 more b’s than a’s}. (d) The language of all strings over {a,b} that have a b in every odd position (first symbol is considered position 1; empty string should be accepted)...
1. Write DFA, NFA (small), regular expression and right linear grammar for strings over {a,b} a. End in either aa or bb b. ( an | bna) n >= 0 c. {w : w such that w contains the substring “bb” or w contains an odd number of a’s (or both). d. {w : w does not contain exactly two a’s} e. { w : w starts with substring abb and contains substring bba}
Write a regular expression that captures the set of strings composed of 'a', 'b', and 'c', where any string uses at most two of the three letters (for example, "abbab" is a valid string, or "bccbb", or "ccacaa", but not "abccba": strings that contain only one of the three letters are also fine). Give a non-deterministic finite automaton that captures the regular expression from Using the construction described in class, give a deterministic version of the automaton. Repeat the previous...
Provide a regular expression for the following languages: (a) the set of all strings over {a, b} that start with ab and end with ba, (b) the set of strings over {a, b} where four consecutive occurrences of both letters occur in every word.
Give a regular expression for the language of strings over {a,b} in which each substring of length 2 contains two distinct characters
Construct a regular expression that recognizes the following language of strings over the alphabet {0 1}: The language consisting of the set of all bit strings that contain two or three symbols.
Write down the regular expressions for the following set of strings over {a, b}: 1.Strings that contain no more than one occurrence of the string aa. 2.All strings containing aba: 3.All strings of odd length 4.A string in this language must have at least two a's. 5.All strings that begin with a, and have an even number of b Bonus - All strings with “a” at every odd position
(a) Give 2 strings that are members of language specified by the regular expression (0+ 1)∗ but are not members of the language specified by 0∗ + 1∗ . Then give 2 strings that are members of both languages. Assume the alphabet is Σ = {0, 1}. (b) For each of the following languages specified by regular expressions, give 2 strings that are members and 2 strings that are not members (a total of 4 strings for each part). Assume...