1. (10 points) Give set notation definitions of languages over = {a,b} described by the following regular expressions: a. (a U (bb)*)* b. (& U *a)b(bb)* 2. (15 points) Write regular expressions for the following languages: a. A = { x over {a,b} | x starts with even number of a's} b. B = { x over {a,b} | x has at most one substring bb} C. C = { x over {a,b,c} | x has at least one cand at most three c's}