Matrix Definition and Representation

Q. The number of $3\times 3$ matrices that can be formed using the elements $0,1,2,3$ such that all principal diagonal elements are different, is

1. $6\times 4^6$
2. $6\times 4^7$
3. $6\times 3^7$
4. $4^7$

Q.

If $\left[a_{ij}\right]$is an element of matrix A then it lies in $i^{th}$ row and $j^{th}$ column of the matrix

1. True

2. False