Say I own 60 champs. That means the odds of getting the same one twice in a row is 1/60 multiplied by 1/60 which is 1/3600. Yet this happens alllll the time. The algorithm is terrible. Not even close to random.
It isn't really 1/3600 because there are several things that need to be considered:
- The champions you own.
- The champions you don't own.
- The champions your teammates and the enemy team own or don't own.
- Which free week champions are available to play (because you can roll them in ARAM).
I'm sure the code for the ARAM algorithm is pretty crazy, but because of all the external factors that you can't control, it won't ever truly be random.