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Coin Tossing

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A statistics professor distributes a 50-question true/false test. During the exam, the professor notices that one student, sitting in the very back of the room, is flipping a coin and writing down answers. This goes on for two full hours, and after all other students have left, the student is still flipping the coin and writing answers.

The professor approaches the student. "Listen," she says, "I know you weren’t prepared for this test, and I know that you’ve been flipping a coin to determine the answers. But what I don’t understand is, what could possibly be taking you so long?"

"Shhh," says the student. "I’m checking my answers!"