Well, it is the case that all the random sequences together have much larger probability than HHHHHHHHHHHH , and so we should expect the sequence to be one among the random sequences.
edit: interesting issue: suppose you assign some prior probability to each possible sequence. Upon seeing the actual sequence, with probability that your eyes deceived you 0.0001, how are you to update the probability of this particular sequence? Why would we assume sensory failure (or a biased coin) when we observe hundred heads, but not something random-looking? It should have to do with the sensory failure being much less likely for something random looking.
Well, it is the case that all the random sequences together have much larger probability than HHHHHHHHHHHH , and so we should expect the sequence to be one among the random sequences.
edit: interesting issue: suppose you assign some prior probability to each possible sequence. Upon seeing the actual sequence, with probability that your eyes deceived you 0.0001, how are you to update the probability of this particular sequence? Why would we assume sensory failure (or a biased coin) when we observe hundred heads, but not something random-looking? It should have to do with the sensory failure being much less likely for something random looking.