+0  
 
+1
71
1
avatar

Each unit square of the 4x4 grid below is to be filled in with the number 1, 2, 3 or 4, so that:

Each row contains the numbers 1, 2, 3, and 4 in some order,

Each column contains the numbers 1, 2, 3, and 4 in some order, and

Each  square (outlined in bold) contains the numbers 1, 2, 3, and 4.




Some of the squares have already been filled in. Find the number of ways of filling in the rest of the grid.

 May 31, 2023
 #1
avatar
0

 

Each unit square of the 4x4 grid below is to be filled in with the number 1, 2, 3 or 4, so that:  

Each row contains the numbers 1, 2, 3, and 4 in some order,  

Each column contains the numbers 1, 2, 3, and 4 in some order, and   

Each  square (outlined in bold) contains the numbers 1, 2, 3, and 4.  

 

 

I can't see the grid.  But you can do this by just   

rotating the sequence of the numbers one over.  

 

Like this:   

 

                                   1   2   3   4   

                                   2   3   4   1   

                                   3   4   1   2   

                                   4   1   2   3   

.

 May 31, 2023

1 Online Users

avatar