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Basic Probability

Mathematics, Probability and Poker

Contents

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Probability and Odds


Probability is expressed in terms of a proportion (or percentage) of times an event will occur. A probability of .2 means that the event in question is expected to occur 20% of the time.

Odds in N


20% translates neatly into 1 time in 5. That's 1 occurance in 5 trials.

Odds to N


But usually we express odds in terms of how many times the event will occur compared to how many times it will fail to occur. With the 20% probability example that would be 1 to 4. For every 5 trials we expect 1 success and 4 failures.

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  • Alspach's Mathematics and Poker Page
    Brian Alspach used to write a regular column on combinatorics for Poker Digest. He's a retired math professor from Simon Fraser University.
  • Tom Ferguson's home page
    He's a math ;professor at UCLA and Chris Ferguson's father.
  • MathPages.com
    A collection of straight-forward introductions to various topics in mathematics and recreational mathematics.

Kelly betting

These are all somewhat technical articles.