Thread: balding and nichols equation, allelic frequency help

does anybody know what to do with the answer once you have used the equation on all loci, and multiplied them together, i have an answer like this..
0.0000000000000000074...
the answer is supposed to prove the chance of a matching profile from the population is more than 1 in a billion, so do i do 1 divided by my answer, or something connected to the number of ppl in the database.
confused!!
if i do 1 divided by ans, it looks right but i want to actually understand why as i have to stand up in court and give evidence for my exam so i need to actually understand the answer so i can explain it