Question

Find the cardinal number of the set {1:15N.x57}​

Answer 1

Answer:

Cardinal Number of a Set: The number of elements in a set is the cardinal number of that set. Notation: If a set A is equivalent to the set {1, 2, 3, …, N}, we write n(A) = N and say “The cardinal number of set A is N.” Also, n(Ø) = 0. The cardinal number for an empty set is zero.