Question 875438
<pre>
|4 6 8| 
|2 4 0| 
|4 6 8|

Subtract the first row from the third row:

|4 6 8| 
|2 4 0| 
|0 0 0|

That's 0 because the value of any determinant 
with an all-zero row or column is 0. 

Edwin</pre>