Define cardinality of a set.

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Solution

Cardinality of a set X is defined as the number of elements in the set X. Cardinality of a set X is denoted by n(X). Cardinality of an infinite set is $\infty$ . Cardinality of a null set is 0.

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\begin{matrix} A & = {x : x is a whole number less than equal to 10} B & = {x : x is a letter in the word "ARITHMETIC"} C & = {x : x is a prime number less than 30} \end{matrix}

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