The total number of elements/items in a set is called its Cardinal Number.
Order of elements does not matter in a set.
A cardinal number is a nonnegative integer.
The cardinal number of the set A = {2, 3, 5, 7, 9} is 5.
A. 5
B. 23
C. 91
D. 6
Correct Answer: D
Step 1: The number of elements in a set is called its cardinal number. [Definition]
Step 2: So, cardinal number of set A is 6.
Q1: What is the cardinal number of the set {a, b, c, d}?
Q2: What is the cardinal number of the set {1, 2, 2, 3}?
Q3: If set A = {23, c, #, II, %, 91}, then find its cardinal number.
Q: Does the order of elements matter when determining the cardinal number?
A: No, the order of elements in a set does not affect its cardinal number. Only the unique elements are counted.
Q: Can a set have a cardinal number of 0?
A: Yes, an empty set (a set with no elements) has a cardinal number of 0.