1. the probability of all occurrences is 1


2. probability has a value which is greater than or equal to zero


3. when occurrences cannot coincide their probabilities can be added
   From these axioms, dressed in technical language, the mathematical
   properties of probability can be deduced. The concept of probability can be
   widely applied. Much of modern life cannot do without it. Risk analysis, sport,
   sociology, psychology, engineering design, finance, and so on – the list is
   endless. Who’d have thought the gambling problems that kick-started these ideas
   in the 17th century would spawn such an enormous discipline? What were the
   chances of that?

the condensed idea

The gambler’s secret system