This is the outbreak. The one person (black) is infected in a small room (n×n). The neighbors (yellow) can't escape from the infection. n(n+1)/2 is the half of the square.
n is expansion, so viruses are everywhere.
P is probability, but you need time to extinguish us all. 100 people are almost dead (50%) in this century, but the chance is 1% every year.
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