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12 cards from this deck
How likely something is to happen
Between 000 and 111
Impossible - will never happen
Certain - will definitely happen
As likely as not (50-50 chance)
Favourable outcomes ÷ total outcomes
When all outcomes are equally likely
Fair or at random
Must equal 111
Pairs where one or other happens, but not both
P(event)+P(not event)=1P(\text{event}) + P(\text{not event}) = 1P(event)+P(not event)=1
Subtract known probabilities from 111
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