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P( ext{event}) = rac{ ext{favorable}}{ ext{total}}
When all outcomes are equally likely
When order of items matters
When order doesn't matter
Find total number of possible outcomes (denominator)
Count favorable outcomes (numerator)
Multiply the numbers together
Add together the different cases
P(extatleastone)=1−P(extnone)P( ext{at least one}) = 1 - P( ext{none})P(extatleastone)=1−P(extnone)
Between 0 and 1
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