In 3D, there are 10 spans * *, which are numbers 0-9 respectively. A span of 0 indicates one of the ten groups with the prize number "Leopard". The span is 1, indicating that the lottery number is a serial number of three groups of numbers. By analogy, different spans correspond to different combinations of numbers.
1: Span can be further subdivided into three different types: according to odd and even numbers, it can be divided into odd span 1, 3,5,7,9 and even span 0,2,4,6,8; According to the remainder divided by 3, it can be divided into 0 spans 0, 3, 6, 9, 1 span 1, 4, 7 and 2 spans 2, 5, 8; According to prime number, it can be divided into prime number span 1, 2, 3, 5 and 7 and composite number span 0, 4, 6, 8 and 9. Subdivision span can effectively filter number combinations.
2. In the 3d span selection of Fucai, when the selected span value is singular, its numerical structure must be 2 singles 1 or 2 singles 1, and all odd and even forms can be excluded. The lottery 3d span number selection method can be used as an auxiliary method for direct election. That is, after selecting the required number, the span analysis method is used to correspond to its directly elected number. Generally speaking, even span and odd span have a characteristic, that is, they last for three or four periods, which can be used as a reference to judge the span value of the next period. For example, if we judge that the span value of a certain period is singular, and the odd and even numbers of the prize number are 2 odd numbers 1 pair, then the odd and even numbers appear as a hundred or unit, and the two odd numbers are two adjacent numbers.