1 in 10^2,685,000
The total possible combination of alleles for those genes in humans is approximately 70,368,744,177,664. This is trillions of times more combinations than the number of people who have ever lived. This accounts for the fact that nearly everyone, except monozygotic twins, is genetically unique. With this context and timeframe in mind, the demographers estimate that 109 billion people have lived and died over the course of 192,000 years. If we add the number of people alive today, we get 117 billion humans that have ever lived. The probability of that happening comes out at about 1 in 10 . For comparison, the Universe only has 1080 atoms. The infographic finishes by letting you know that the probability of you existing as you is pretty much zero.
