Question

what is a={2,5,7,8},b={4,8,2,5,9},c={1,4,6,8}find a'

Answer 1

Universal Set = a U B U c = {1,2,4,5,6,7,8,9}
a' = U-a = {1,2,4,5,6,7,8,9}-{2,5,7,8} = {1,4,6,9}