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What is defeating the ancient philosophers?
Also known as Baizi diagram and Bai Zi superposition method. It is a traditional practice method of abacus addition and subtraction. The steps are as follows: firstly, add 1, 2, 3, 4 and 5 to the abacus in turn until it is added to 100, making a total of 5 050 (i.e.1+2+3+4+5 …+100 = 5050).
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