A={ x | 2 ≤ x < 4 }
∴A∩B= empty set,
A ∪ b = {x | 2 ≤ x < 4, or x≥5}
2.∫A = {x | x is an integer less than 9}, B={ 1, 2,3}, C = {3,4,5,6}.
∴A∩B=[ 1,2,3}
B∩C={3},B∪C={ 1,2,3,4,5,6}
A∩(B∪C)={ 1,2,3,4,5,6}
A ∨( B∩C)= A = {x | x is an integer less than 9},
3\A∪B refers to students who run 100 meters or students who run 200 meters.
A∩C means students who have participated in the 100 meter race and students who have participated in the 400 meter race.
9\ The title is copied wrong.