Yes, essentially. While 21 heads in a row is very unlikely (when you consider it ahead of flipping any coins), by the time you get to 20 heads in a row most of the unlikely-ness of it has already happened, with the odds of one more head remaining the same as ever.
Yes, essentially. While 21 heads in a row is very unlikely (when you consider it ahead of flipping any coins), by the time you get to 20 heads in a row most of the unlikely-ness of it has already happened, with the odds of one more head remaining the same as ever.