what is meant by set { }, set ø and set {ø} find number of elements in set A{x : x =ø, {ø}, { } } Share with your friends Share 1 Shruti Tyagi answered this Dear Student, reprsents a set with no elements or empty setϕ also represents an empty setbasically ϕ=ϕ this represent a set of empty setNow to calculate the number of elements in A x:x =ϕ, ϕ, both ϕ and are empty set with cardinality 0while ϕ is set of empty set with cardinality 1Hence number of elements in set A=1 Regards, -1 View Full Answer