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appears as an exercise in Sunzi Suanjing (between the third and fifth centuries). The result was later generalized with a complete solution called Da-yan-shu ??? in Qin Jiushao's 1247 Mathematical Treatise in Nine Sections. There is also some numerical mysticism in Chinese mathematics,Method: Put down 49, add the gestation period and subtract the age. From the remainder take away 1 representing the

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