Question 1 Why do we use equivalence rules? Question 2 Find the cardinality of S = Exists a y such that y = (2-1012) and x=y") Question 3 Find out if the following is a proper function For two sets A and B formed by the elements A = {a,b,c,d) B={1,2,3,4,5,6) We define the function where is an element of A and is an element of B such that f(a)=4 f(b)=5 f(c)=1 f(a)=3