I need solution of exercise 1,2 and 4...!

EXERCISE 1 Restate each of the following languages by listing its contents. For example, if the language is shown as (x e a, bi S 2, your answer should be e, a, b, aa, bb, ab, ba d. nis less than 20 and divisible by 3) EXERCISE 2 List all strings of length 3 or less in each of the following languages: b. la, b EXERCISE 3 Many applications of formal language theory do associate meanings with the strings in a language. Restate each of the following languages by listing its contents: a. (x E (0, 1*| x is a binary representation, without unnecessary leading zeros, of a number less than 10) b. e (0, 1, 2, 3, 4, 5, 6,7, 8, 9 is a decimal representation, without unnecessary leadin g zeros, of a prime number less than 20) {re {a, b, , z}* x 1s a two-letter word in English) c. EXERCISE 4 Restate each of the following languages using set former notation. a. the language of all strings over the alphabet fa, b that begin with a b. the language of all even-length strings over the alphabet a, b, c c. the language of strings consisting of zero or more copies of the string ba d. the language of strings consisting of any number of as followed by the same number of bs, followed by the same number of cs