Talk:Sword of the Divine/@comment-81.205.101.193-20100923140226/@comment-24.141.104.36-20110109232152

All possible outcomes (S is success, F is failure): FFF (0.8 * 0.8 * 0.8 = 0.512) FFS (0.8 * 0.8 * 0.2 = 0.128) FSF (0.8 * 0.2 * 0.8 = 0.128) SFF (0.8 * 0.8 * 0.2 = 0.128) FSS (0.8 * 0.2 * 0.2 = 0.032) SFS (0.2 * 0.8 * 0.2 = 0.032) SSF (0.2 * 0.2 * 0.8 = 0.032) SSS (0.2 * 0.2 * 0.2 = 0.008) Total of all of them = 1.000

You're trying to find the chance that at least one succeeds. You -could- manually calculate the probability of every single outcome with at least one success, then add them all together. Or you could just calculate the chance they all fail (the only unwanted outcome) and subtract it from the 100% total to get the exact same number. Your call.