Question

what is the cardinal number of the set:

{yellow,blue red,green,purple,orange}

Answer 1

The cardinality of a set is the number of distinct elements in the set.

For example, the cardinality of the set {1,3,5,7,9} is 5.

Note that a set generally does not contain identical elements, so the cardinality of the set {apple, orange, apple} is 2.