Yep you're right it isabraker wrote:
And the division by 36 choose 19?
This one is impossible:
But that is not in what I was calculating. What I was calculating was the chance for the 19TH call to be the bingo. Which means to find out the cumulative chance you need to find the probability of winning at the 6th call, 7th call... to 19th call and add(not multiply) them all together.
Now why the cumulative chance is because the quote states that he is impressed by the fact that Kai doesn't have a BINGO, which means the bingo could have happened anytime prior to 19 if you interpret it that way