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Given the set a = {1,3}, and AUB = {1,2,3,4}, then there are at most several set pairs (a, b) satisfying the condition

Given the set a = {1,3}, and AUB = {1,2,3,4}, then there are at most several set pairs (a, b) satisfying the condition

According to the meaning of the title, B must contain {2,4}, and can also contain the elements in {1,3}
That is, there are at most four (a, b)

Let u = {1,0,1,2,3,4,5}, set a = {1,2}, set B = {2,3,5}, find ① AUB, ② Cu (AUB)

①AUB=｛1、2、3、5｝②CU（AUB）=｛-1、0、4｝

Let a = [2.4] and B = [- 2.3], then the solution set of AUB

{-2,2,3,4}