here are
people in the room. What is the probability that at least two of them have the
same birthday?
Set
We are interested in
we fix a person
A,
by the formula (
Bayes
formula
)
where
is the probability that a particular person has the same birthday as A,
is the probability that a particular person does not have the same birthday as
A,
is the probability that in a group of
randomly selected individuals no one has the same birthday as A and
is the probability that in a group of
randomly selected individuals someone has the same birthday as A.
