How to solve this problem

Question

Given the sets U = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9}, A = {5, 6, 7, 8, 9}, and B = {0, 2, 4, 7, 9}, use De Morgan's laws to find the indicated set. (Enter your answers as a comma-separated list. Enter EMPTY for the empty set.)

(A' ∪ B)'

Answer 1

A={5,6,7,8,9}

A'={0,1,2,3,4}

B={0,2,4,7,9}

B'={1,3,5,6,8}

A'UB= {0,1,2,3,4,7,9}

(A'UB)'= {5,6,8}

(A'UB)' =A"^B'= A^B' ={5,6,8} by de morgan's law