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The math problem that stumped thousands of mansplainers
The reason this confounds people is that they look at it from the wrong end.
Let's say I told you that on this beach, 1 particular grain of sand is actually worth a trillion dollars (and I know which one it is).
I get you to pick a grain of sand. Your odds are trillions to one, right?
Now, after you pick, let's say I remove one more grain and ask you to pick again. Should you switch? eh... your odds are still trillions to one.
But now let's say I removed all other grains of sand EXCEPT one. Which is more likely? That you picked the trillion to one grain, or that I've shown you the correct answer?