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Probability theory

The definition of probability is the ratio between the number of favorable outcomes and the number of possible outcomes

    P(G) =   number of favorable outcomes 
  number of possible outcomes



If you play with a dice, the chance to throw a 1, 2, 3, 4, 5 or 6 is always the same. If you necessarily want to throw a 6 the chance of that is exactly . There is only 1 favorable outcome and there are 6 possible outcomes. You write this as

because you see that right away.


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