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Probability is the likelihood or measure of a specific event taking place [1].

Usually represented as a percentage, probability is always a number smaller that 0, where a value of 1 represents definite certainty of a even, meanwhile 0 represents an impossible event.

Probabilities of multiple numbers of events all happening at once can be worked out given 2 criteria:

  1. You have the probability of each event taking place
  2. The events are not mutually exclusive ( can happen at the same time)

Probabilities of events that are non-mutually exclusive can be worked out through multiplying the probability of each individual event together.

For example the probability of rolling two 6’s on a set of dice is 1/36. This Is worked out because the probability of rolling a 6 is 1/6 as there are 6 sides, and (1/6)*(1/6)=1/36.


  1. (Webster’s Revised Unabridged Dictionary. G & C Merriam, 1913)
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