Matrices and Determinants Part 1

[

1	...	⋯
⋯	1	⋯
⋯	...	1

]
are 6 non-singular matrices because 6
blanks will be filled by 5 zeros and 1 one.
Similarly, [

...	...	1
...	1	...
1	...	...

] are 6 non-singular matrices.
So, required cases are more than 7 , non-singular 3×3 matrices.