Which pair of statements is true? consider the sets below. u = {x | x is a real number} a = {x | x is an odd integer} r = {x | x = 3, 7, 11, 27} is r ? a? yes, because all the elements of set a are in set r yes, because all the elements of set r are in set a no, because each element in set a is not represented in set r no, because each element in set r is not represented in set a