The Odds of Rolling

To Roll At Least A ... Single Roll With Advantage With Disadvantage
1 100.00% 100.00% 100.00%
2 95.00% 99.75% 90.25%
3 90.00% 99.00% 81.00%
4 85.00% 97.75% 72.25%
5 80.00% 96.00% 64.00%

6 75.00% 93.75% 56.25%
7 70.00% 91.00% 49.00%
8 65.00% 87.75% 42.25%
9 60.00% 84.00% 36.00%
10 55.00% 79.75% 30.25%

11 50.00% 75.00% 25.00%
12 45.00% 69.75% 20.25%
13 40.00% 64.00% 16.00%
14 35.00% 57.75% 12.25%
15 30.00% 51.00% 9.00%

16 25.00% 43.75% 6.25%
17 20.00% 36.00% 4.00%
18 15.00% 27.75% 2.25%
19 10.00% 19.00% 1.00%
20 5.00% 9.75% 0.25%