Q.1 Find the union of each of the following pairs of sets :
(iii) A = {x : x is a natural number and multiple of 3} B = {x : x is a natural number less than 6}
Here ,
A = {3,6,9,12,15,18,............}
B = {1,2,3,4,5,6}
Union of A and B is A B.
A B = {1,2,3,4,5,6,9,12,15........}