Two-color ball red ball number (1-33)+ blue ball number (1- 16) has the following combination changes:

(1) The combination of red ball and blue ball is 1772 1088.

(2) There are 64 variations in the combination of odd and even numbers.

(3) There are 28 changes in the three-zone ratio number combination, and 25 changes are commonly used. The following is a comparison of three aspects:

The three-zone ratio is to divide the red ball number (1-33) into three groups, and (1-1) is one zone; (12-22) is the first area; (23-33) is the first area. For example, the ratio of the three areas is 1: 2: 3. That is, select the number 1 from the numbers (1-1); Select two numbers from the numbers (12-22); Select three numbers from the numbers (23-33). Other areas than this reasoning.