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The probability scale

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The scale runs 0 to 1

Every probability lives between 0 and 10impossibleunlikely0.5even chancelikely1certain1/2 = 0.5 = 50%The same probability, three ways of writing it.Nothing sits below 0 or above 1.
Impossible is 0, certain is 1 — everything else is in between.
  1. 1Impossible events have probability 0.