What is the complement of the empty set for the universal set U = {1,2,3,4,5,6,7,8,9,10}

Question

Consider the following universal set U = {1,2,3,4,5,6,7,8,9,10}
a. what is the compliment of the empty set for this universal set?

b. what is the compliment of {2,5,9,10} for this universal set?

Answer 1

a. Compliment of the empty set={1,2,3,4,5,6,7,8,9,10}

b. Compliment of {2,5,9,10}={1,3,4,6,7,8}