Quote (Meridius @ Jun 18 2019 11:40pm)

the key sequence/order does not matter at all. As it is random the chances for one order to work is the same for another

2 door = 1/2 x 1/1 = 50% = expected pass after 2 tries
3 door = 1/3 x 1/2 x 1/1 = 16.6666% = expected pass after 6 tries
4 door = 1/4 x 1/3 x 1/2 x 1/1 = 4.16666% = expected pass after 24 tries
5 door = 1/5 x 1/4 x 1/3 x 1/2 x 1/1 = 0.83333% = expected pass after 120 tries
6 door = 1/6 x 1/5 x 1/4 x 1/3 x 1/2 x 1/1 = 0.13888% = expected pass after 720 tries

the total chance to do a reset is actually 1/1022. To explain it: once you passed a class you do not need to redo it once you failed the next mq. With that in mind you need to add the individual expected tries instead of multiply them.