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Mathematical problems in Olympic mathematics
All results: AC AD BC BD CC CD

Because the probability of two turntables turning to each letter is equal, the probability of the above six situations is equal to 1/6, so the probability of winning is 1/6.

From the perspective of probability theory, which letter the two turntables turn to is an independent event, and the probability of turning to C at the same time is the product of two probabilities equal to1/3 *1/2 =1/6.