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Fig. 7.2
The 64 subsets of a set of 6 elements, grouped in columns of equinumerous subsets
rare events: a number
n
very big of possible events and a probability
p
very small
of having
k
successful events . In this case, if we call
λ
the product
np
(
λ
real), the
probability is given by the following Poisson distribution (of parameter
λ
):
k
k
!
.
e
−
λ
λ
p
(
k
,
λ
)=
