Talk:Relena's 3rd Challenge!/@comment-124.104.238.106-20170123134135/@comment-29349735-20170123142445

Take 100% minus each of those percentages to get the chance it does not proc. Then, multiply these together to get the percent chance that NO card procs. Subtract it from 100% again to get the chance that at least one card procs.

For your example, the non-proc rates are 75%, 70%, 70%, 70%, 70%. Multiply these to get 18% as the chance that nothing procs. The chance that something procs is then 100% - 18% = 82%.