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Calculating Probability without the Formula
Worked Examples
Probability : Definition and Notation
Probability is basically the chance of something happening.
Sample space
U This is the set of all things that can happen. (Outcomes)
Examples:
Rolling a fair dice once. U = {1,2,3,4,5,6}
Tossing a coin once. U = {Heads, Tails}
Often the sample space may be more complicated than this and we may not always be able to this all the outcomes, hence there are formulas we can use to
calculate the probability of something happening. You we see several different ways of calculating probability.
Number of outcomes
n (U)
Example for rolling a fair dice n (U) = 6 and for tossing a coin n (U) = 2
Probability that an event will happen
P (A) This represents the probability that event A will happen.


MATH STUDIES
Logic, Sets and Probability
Probability Formulae
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Examples
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Examples
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