So be it then P ( D ) {\displaystyle P(D)} the probability of finding, in the sample of our n {\displaystyle n} people, individuals who present the elements belonging to the aforementioned set D = { δ 1 , δ 2 , . . . , δ n } {\displaystyle D=\{\delta _{1},\delta _{2},...,\delta _{n}\}}
