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This slide shows a diagrammatic representation of capture-recapture methodology.

N = size of population

N = estimate of size of population

m = number in sample 1

n = number in sample 2

c = number in common

p1 = probability of inclusion in sample 1 = m/N

p2 = probability of inclusion in sample2 = n/N

p12 = probability of inclusion in both samples = c/N