The table shows the cumulative odds of getting at least one item given a 0.1% drop rate (one in a thousand)
I.E. a 1/1000 drop rate does not mean that if you kill 1000 you WILL get one; rather since the chance is 0.1% each time you kill the mob, then the odds of getting at one from N kills is 100% minus 99.9%N. Furthermore, since the cumulative odds never quite reach 100%, it is possible—albeit unlikely—to never get one.
|Number of Kills||100||288||401||693||1386||2302||2995||4603||9206|
|Neither the drop rate nor cumulative probability increases based on the number of monsters you have already killed.|