Question

D = {x|x is a whole number} E = {x|x is a perfect square between 1 and 9} F = {x|x is an even number greater than or equal to 2 and less than 9} Which of the following is an element of D ∩ (E ∩ F)?

Answer 1

E = {x|x is a perfect square between 1 and 9} = {1,4
F = {x|x is an even number greater than or equal to 2 and less than 9}
D = {x|x is a whole number}

answer
D ∩ (E ∩ F) = 4