Non-fiction i do believe
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The sum of all numbers is 50. Let's say there have been 50 events, for which property A, B or C holds.
In the center of A, B and C, there is the number 8, which would mean that for 8 out of 50 events, all three properties hold.
The chance of this happening is 8/50 = 4/25 = 0.16
