Question 56468
I make it 13 combinations. Check out the order in which they are listed to see the method used to find them all.

QDN	
2	1	0	
2	0	2	
1	3	1	
1	2	3	
1	1	5	
1	0	7	
0	6	0	
0	5	2	
0	4	4	
0	3	6	
0 2	8	
0	1	10	
0	0	12