Consider the following sets. A = {1,2,3,4}, B = {2,3,5}, and C = {x|0 < x < 6 and x is an integer }.

1.Write the union of sets A and C by enumeration.

2.Is A a subset of C? If so, is it proper or improper? Explain why, carefully.

3.Write all the improper subsets of set B.

4.Write the set C by enumeration.

5.Suppose the universal set U is all real numbers. Write the set C.

6.Of all the subsets of B, which one has the fewest number of elements?