1.what are the Elements in the Set?

(A D E)

{1}

{6,11,12,17,18,19,20}

{1,2,3,4,5,7,8,9,10,13,14,15,16}

or {x U : x 1}

2.what are the Elements in the Set?

BE

{5}

{12,15,16}

{3,4,8,9}

or {1,2,5,15,16}