MATH 140 - Lecture 1 Worksheet 1. (a) Write out the following sets as lists: i. {n E Z : n is even} ii. {n? : n E N} iii. (x e Z : (x) -3} (c) Are the following two sets equal? i. {2, 3, 5, 7} and {7, 5, 2, 3} ii. {3n : n E Z} and {. .., -6, -3, 0, 3, 6, ...} iii. {2, 3, 5, 7} and {2, 3, 6, 7} iv. Z and {0, 1, -1, 2, -2, 3, -3, . . . } (d) What is the cardinality or size of the following sets? i. {c EN : (x|