If U={ 1,2,3,4,5,6,7,8,9} is the universal set A ={ 2,4,6,8} then find the complement of A

If A ={1,2,3,4} and U={1,2,3,4,5,6,7,8} is universal set, then write the complement of set A .

Let U= { 1,2,3,4,5,6,7,8,9,10 } be the universal set and let A = {2,3,4,5,6} and B = { 3,5,7,8} be its subsets . Find A'

Let U= { 1,2,3,4,5,6,7,8,9,10 } be the universal set and let A = {2,3,4,5,6} and B = { 3,5,7,8} be its subsets . Find B'