"While in theory randomness is an intrinsic property, in practice, randomness is incomplete information."

Nassim Nicholas Taleb

An essayist, researcher, and former practitioner of mathematical finance.

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Randomness is the apparent lack of pattern or predictability in events. 

A random sequence of events, symbols or steps often has no order and does not follow an intelligible pattern or combination. Individual random events are, by definition, unpredictable, but if the probability distribution is known, the frequency of different outcomes over repeated events (or "trials") is predictable.