1. A U B = (This set contain element either in set A or in set B and repeated element comes only once )
Therefore A U B ={ a,b,c,d,e,f,g,h}
2. A ∩ B= (This set contain element set A and in set B (both) )
Therefore A ∩ B ={ a,b,c,d,e}
3. A -- B(Set difference)= (This set contain element in set A and not in set B)
Therefore A --B ={ empty} or Φ because none of the element in set A which is not in B.
4. Same as that B--A = (f,g,h)