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| Scope: 數學九章 |
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《卷一上》
65  | 假今用蓍四十九信手分之為二則左手竒右手必偶左手偶右手必竒欲使蓍數近大衍五十非四十九或五十一不可二數信手分之必有一竒一偶故所以用四十九取七七之數始有左副二十四內益十二就其三十七泛為用數但三十七無意義兼蓍少太露是以用四十有九凡揲蓍求一爻之數欲得一二三四出於無餘必令揲者不得知故以四十九蓍分之為二只用左手之數假令左手分得三十三自一一楪之必竒一故不繁楪乃徑掛一故易曰分而為二以象兩掛一以象三次後又令筮人以二二揲之其三十三亦竒一故歸奇於㧅又令之以三三揲之其三十三必奇三故歸奇於㧅又令之以四四揲之又奇一亦歸奇於㧅與前掛一併三度揲通有四㧅乃得一一三一其掛一者乘用數圖左上用數一十二其二揲㧅一者乘左副用數二十四其三揲㧅三者乘左次用數四得一十二其四揲一者乘左下用數九 |
| 67 | 左行三㧅謂之三變 |
| 68 | 掛一得一十二㧅一得二十四㧅三得一十二又㧅一得九並為總數 |
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