+0  
 
0
154
2
avatar+43 

Let's play mini-Sudoku!

We wish to place an "X" in four cells, such that there is exactly one "X" in each row, column, and 2x2 outlined box.

For example:

In how many ways can we do this?

(Terminology: A cell is one of small 1x1 spaces. A box is one of four outlined 2x2 group of cells.)

Jz1234  Jul 8, 2017
Sort: 

2+0 Answers

 #1
avatar+77131 
+3

 

This was answered a while back, but the answer ends up being 16

 

4 ways to place the X in the top row

2 ways to place the X  in the second row [ in the other 2 x 2  box not occupied by the first X ]

2 ways to place the X in the  third row  [ we can choose either of the two empty columns]

Only 1 way  to place the last X in the last empty column

 

So   ....4 x 2 x 2 x 1   =  16

 

 

 

cool cool cool

CPhill  Jul 8, 2017
 #2
avatar+4777 
+2

Here's the older one if it helps any:   https://web2.0calc.com/questions/question-asap   smiley

hectictar  Jul 9, 2017

23 Online Users

avatar
avatar
avatar
avatar
We use cookies to personalise content and ads, to provide social media features and to analyse our traffic. We also share information about your use of our site with our social media, advertising and analytics partners.  See details