If X = {3,4,5,6} and Y = {1,2,3,8} then X∪Y is ______?

{3}

{1,2,3,4,5,6,8}

{1,2,3,4,5,6}

None of these

The union (∪) of sets includes all unique elements from both sets.

From X = {3,4,5,6} and Y = {1,2,3,8}, their union is {1,2,3,4,5,6,8}.