If U = {1,2,3,4,5,6,7,8} and B = {2,4,6,8}, U is ______?

{1,3,5,7}

{1,2}

{1}

None of these

If U is the universal set and B = {2,4,6,8}, then U – B gives the complement of B.

So, U – B = {1,3,5,7}, which are elements in U not in B.