/sci/ - Science & Math

You always get to roll twice. You can prove that the second roll is a guaranteed hit given that the first one didn't but you can't prove, if your first one hit, it wasn't the guarantee. There's no reason to only enforce "at least one hit" on the second roll. Since the chronological order is irrelevant here, both rolls occur at the same time and you only ever get to play with one variable.

50%.

>>11320627
count the total elements of the first two images of each row and see how they result in the third image part by part
>top: 1 line = 1 line
>bottom: 1line = 0 line and 0 line = 1 line
>side: 2 lines = 0 line, implying that 0 line = 2 line
So the only possible answer should be E. Of course I can't be 100% sure but it's not wroth digging anymore