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Grade 8 - Mathematics
4.31 Cardinal Number of a Set
Cardinal number of the set:
The number of elements in a set is called the cardinal number of the set.
Example:
A = {1,2,3,4,5,6}
The cardinal number of the set A is 6 and is denoted by n(A) = 6.
Directions:
Find the cardinal number of the sets. Also write at least five examples of your own.
Q 1
: X = {6,12,18,24,30}.
n(X) = 18
n(X) = 30
n(X) = 6
n(X) = 5
Q 2
: Y = {3,6,9,12,15,18,21}.
n(Y) = 21
n(Y) = 7
n(Y) = 3
n(Y) = 12
Q 3
: A = {3,4,5,6,7,8}.
n(A) = 6
n(A) = 4
n(A) = 5
n(A) = 8
Q 4
: A = {1,2,3,4,5}.
n(A) = 2
n(A) = 5
n(A) = 3
n(A) = 4
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