In 2004 it surfaced in Reader's Digest presented as having unnamed community college. Four students walked in halfway through American history test my father was giving at the local community college. "Sorry," they said, "we had a flat tire." An understanding man, Dad said that if they could answer just one question correctly, he would give them each an "A" for the exam. The students agreed. So my father handed each one a piece of paper, placed them in four separate comers and said, "Write down which tire was flat." - Kurt Smith What is the probability that these four students would give identical answers if they hadn't had a flat tire? Why?

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