RE: RE: We're Burger King Zagorski, You're correct.
The chance of getting heads on a coin on at least one occasion from 3 throws is 0.5 x 0.5 x 0.5 = 0.125
1- 0.125 = 87.5% chance of getting at leads one heads.
The same principle applies to HRT drills. They are independent events just the same as a coin toss.
0.75 x 0.75 x 0.75 = 0.42.
1 - 0.42 = 58% chance of HRT striking on one of their drills.