Does anyone have any idea how often let's say 15-20 red streak come and go? Would like people who have somewhat of an idea, thanks!
You can calculate the odds quite easily. Simply raise the odds of each red happening to the power of the amount of times that you want to account for.
However, one of the more common fallacies in this area is the fact that rolls are not dependent on each other. A lot of people do prerolls and all that in the hopes that they can somehow increase their odds of winning, but what they don't realize is that prerolls don't matter at all because each roll is independent of the other.
That's why I think it's a bit redundant to ask this question to somehow come up with a strategy. Prerolling 19 times doesn't increase the chances of your 20th roll hitting.