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What does Random Look Like?

To tell whether a sequence came from a real coin and a human mind is impossible. However, there are signs which could help someone decipher if a sequence one is real or fake.

For example, the probability that a sequence (of 20 flips) that contains exactly an H or T, is 1 in a 1048576, which is extremely low. That is a telltale sign that a sequence is fake.

What I would expect from a real sequence, is about 50% heads and 50% tails, because there are only 2 states that a fair coin can be in. If I were to give a range, possibly 45% to 55%, however, remember at the end of the day it all relies on chance.