Coincidence theory

My husband, who knows about such things, says it is mathematically improbable that every time we go for a drive in the country, we pass a vehicle traveling in the opposite direction at the same time we are passing a pedestrian. Yet he concedes that it happens. We call this phenomenon “Jim’s Theory of Coincidence” because he is the one who noticed it first.

It turns out there are many theories of coincidence, mathematical and otherwise, which a quick Google search will unearth. Many are used to debunk conspiracy theories, but those are not the ones that interest me. The mathematical ones elude me. I stopped understanding things like “f, g: X } Y” in 10th grade.

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