Question

f  A = { 2,7,9,11}  then the cardinality of set A is​

Answer 1

$\textbf{Given:}$

$A=\{2,7,9,11\}$

$\textbf{To find:}$

$\text{Cardinality of set A}$

$\textbf{Solution:}$

$\textbf{Cardinality:}$

$\textit{Let A be a non-empty set.}$

$\textit{The number of elements of A is called Cardinality}$

$\textit{of set A and is denoted by n(A)}$

$\text{Now, Consider}$

$A=\{2,7,9,11\}$

$\text{Here, A contains 4 elements}$

$\text{Then cardinality of A is 4}$

$\text{In notation,}\bf\;\;n(A)=4$