Ontario Keno draws 20 numbers from a pool of 70 numbers. I've taken the results from 6000 Ontario Keno draws and checked how many of the 20 drawn numbers from 1 draw will repeat themselves in the next draw. Here are the results:
0 - 2
1 - 20
2 - 118
3 - 440
4 - 885
5 - 1318
6 - 1335
7 - 1012
8 - 586
9 - 198
10 - 67
11 - 17
12 - 1
13->20 - 0
The true odds of hitting 10 out of 70 numbers in the Ontario Keno: 396,704,524,216
The odds of hitting 10 out of 20 numbers is: 184,756
9/20 = 167,960
8/20 = 125,970
7/20 = 77,520
6/20 = 38,760
5/20 = 15,504
4/20 = 4,845
3/20 = 1,140
2/20 = 190
0 - 2
1 - 20
2 - 118
3 - 440
4 - 885
5 - 1318
6 - 1335
7 - 1012
8 - 586
9 - 198
10 - 67
11 - 17
12 - 1
13->20 - 0
The true odds of hitting 10 out of 70 numbers in the Ontario Keno: 396,704,524,216
The odds of hitting 10 out of 20 numbers is: 184,756
9/20 = 167,960
8/20 = 125,970
7/20 = 77,520
6/20 = 38,760
5/20 = 15,504
4/20 = 4,845
3/20 = 1,140
2/20 = 190