The Most Distant Ancestor for each tester reflects that proved with a paper trail.
The chart below reflects the chance of two testers sharing a common ancestor within a specified number of generations based upon the number of matching markers.
MRCA = Most Recent Common Ancestor
1 generation = 25 years
Probability for MRCA
Number 50% (MRCA 90% (MRCA 95% (MRCA
of no more no more no more
matching than this than this than this
markers number of number of number of
generations) generations) generations)
11 of 12 17 39 47
12 of 12 7 23 29
23 of 25 11 23 27
24 of 25 7 16 20
25 of 25 3 10 13
35 of 37 6 12 14
36 of 37 4 8 10
37 of 37 2 5 7
65 of 67 6 12 14
66 of 67 4 8 9
67 of 67 2 4 6