Question

Write the cardinal number for the set $A=\left\{s,d,f,g,h,j,k,l,z,x,c,m\right\}$.

Answer 1

A Cardinal number is the number of elements in a finite set. If there is a set$A$, then its cardinal number is denoted as$n\left(A\right)$.

The number of elements in a set $A$ is$12$, i.e., $\mathit{s}\mathbf{,}\mathbf{}\mathit{d}\mathbf{,}\mathbf{}\mathit{f}\mathbf{,}\mathbf{}\mathit{g}\mathbf{,}\mathbf{}\mathit{h}\mathbf{,}\mathbf{}\mathit{j}\mathbf{,}\mathbf{}\mathit{k}\mathbf{,}\mathbf{}\mathit{l}\mathbf{,}\mathbf{}\mathit{z}\mathbf{,}\mathbf{}\mathit{x}\mathbf{,}\mathbf{}\mathit{c}\mathbf{,}\mathbf{}\mathit{m}$.

Hence the cardinal number will be$n\left(A\right)=12$.