When you've finished your 30%, its chance is over. That means, the next scroll has 30% chance of working, no matter how hard you try.
Failing 7 in a row is harder than failing 6 in a row. But if you've failed 6 in a row, the chance of failing the next is 70%(35%).
Since we don't know how the probability is "calculated", we just have to assume. However, I'd like to believe that all effects in-game uses the same random-algorithm from the server.
Failing 7 in a row is harder than failing 6 in a row. But if you've failed 6 in a row, the chance of failing the next is 70%(35%).
Since we don't know how the probability is "calculated", we just have to assume. However, I'd like to believe that all effects in-game uses the same random-algorithm from the server.

