In the matrix, write :
$A=\left[\begin{array}{c}2\\ 35\\ \sqrt{3}\end{array}\begin{array}{c}5\\ -2\\ 1\end{array}\begin{array}{c}19\\ \frac{5}{2}\\ -5\end{array}\begin{array}{c}-7\\ 12\\ 17\end{array}\right]$

(i) The order of the matrix
(ii) The number of elements 
(iii) Write the elements $a_{13},a_{21},a_{33},a_{24},a_{23}$

(i) In the given matrix, the number of rows is $3$ and the number of columns is $4$.
Therefore, the order of the matrix is $3\times 4$.
(ii) Since the order of the matrix is $3\times 4$, there are $3\times 4=12$ elements in it.
(iii) $a_{13}=19,a_{21}=35,a_{33}=-5,a_{24}=12,a_{23}=\frac{5}{2}$