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It is difficult to remember what you read,especially after many years. How would you address this?

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you've got an analog watch with a second hand. how many times a day do all three of the watch's hands overlap? You're playing a football on a desert island and want to toss a coin to decide the advantage. Unfortunately, the only coin on the island is bent and seriously biased. How can you use the biased coin to make a fair decision?