And NO OTHER RAINBOWS! How is this possible?! The rate is supposedly 9% for crystal x 10 for 90%!
If each crystal has a 9% chance of getting a rainbow, your actual chance of getting a single one is:
1 - (0,91^10) = 1 - 0,389416 = 0,6105 = 61,05%
It has been a while since I studied probability though.
My warning to everyone in here regarding the RNG is that if you get no rainbow units in your first 10+1 pull, it's better to way a day or something like that instead of trying more. I mentioned before how people should be wary of how RNG works, but here it goes a quick explanation:
1) A RNG picks up a "seed" number, which is the start of a sequence. How it does depends on the method.
2) The RNG does some math equations on top of the seed number in order to "pull" the next number of the "random" sequence.
This is where it gets tricky. Let's suppose a number lottery where I can pick numbers from 1 to 100 and let's categorize the possible RNGs:
- Ideal RNG: the chance of every number is 1%. This ideal RNG, as far as I know, doesn't exist.
- Good RNG: The chance of every number is very close to 1%. Some numbers will have a bigger chance to come out, while others a lesser chance, but still a fair game.
- Bad RNG: There are big variations all over the place. Some numbers will be much more common and others might not be pulled at all. This happens because the RNG is a sequence where it does this:
seed -> math equation -> number 1 -> math equation -> number 2 -> math equation -> number 3 -> math equation -> number 4 and so forth.
If the RNG isn't well developed (and this isn't easy), it leads to:
seed -> math equation -> number 1 -> math equation -> number 2 -> math equation -> number 3 -> math equation -> same number as seed -> math equation -> number 1 again -> math equation -> number 2 again and so forth.
Since I am playing about 4 gatcha games currently, I am seeing such pattern from time to time. So if I do a bad pull then I know that my "seed" isn't good and usually wait a few hours or a day to see if my next "seed" is better. So far, it has been working very well.