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In ancient China, two or three math problems (which must be ancient Chinese) were slightly shorter.
1. Looking at the towering seventh floor from a distance, the red light is doubled and the * * * light is 38 1. How many lights are there on the top floor? -Jason Wu, a mathematician in the Ming Dynasty, "Comparison of Algorithms in Nine Chapters"

2. One hundred buns and one hundred monks, but three big monks have not increased; One of the three young monks, and how many big and small monks? -Cheng Dawei, a mathematician in the Ming Dynasty, "The Theory of Algorithm Unity"

3.a drives the sheep to chase the grass, and B pulls a fat sheep to follow; Do you want to ask A and 100? Jia Yun said that there is no difference. If you have to gather together in such a group and add a small group, you have to gather together one by one. Who can guess the mystery? -Cheng Dawei, a mathematician in the Ming Dynasty, "The Theory of Algorithm Unity"