1) Explain whether the following sets closed under following operations? Justify your answer. If a set is not closed under operation, what is its closure under the operation?
a) L = {w E {a , b} * : W ends in a} under function odds, described on String as folIows : odds(s) = the string that 1S formed by concatenating together all of the odd numbered characters of s, (Start numbering the character at 1.) For example, odds ( ababbbb) = aabb.
b) FIN (the set of finite languages) under function oddsL d fined n languages as folIows:
oddsL(L) = {w: 3XE L(w = odds (x)) }.
c) INF (the set of infinite languages) under the function odd L.
d) FIN under the function maxstring,
e) INF under the funetion maxstring.