Write the cardinal number for the set $E = \{e, r, m\}$ .

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Solution

Cardinal number is the number of elements in a finite set. If there is a set $A$ , then its cardinal number is denoted as $n (A)$ .
The number of elements in set $E$ is $3$ , i.e., $e, r, m$
Hence, the cardinal number will be $n (E) = 3$ .

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