There are 6 groups of red balls, one for each group 1-33, and 6 are not repeated. Then the blue ball will go from 1 to 16, which is the whole two-color ball layer.

Two-color ticket is a kind of welfare lottery in China. China welfare lottery "two-color ball" is organized and distributed by China Welfare Lottery Distribution Management Center, which is a "happiness" welfare lottery jointly issued by the whole country.

Since February 16, 2003, online sales have been carried out nationwide, and computer network systems have been used for distribution and sales, and TV lottery tickets have been held regularly. Under the direct leadership of the lottery center, the provincial welfare lottery distribution center participating in the sales of "two-color ball" organizes and manages the sales activities of "two-color ball" in this area.

Extended data:

Lottery bonus, lottery issuance fee and lottery public welfare fund are accrued according to 5 1%, 13% and 36% of the current sales of two-color ball respectively. Lottery bonuses are divided into current bonuses and adjustment funds, of which current bonuses account for 49% and adjustment funds account for 2%.

If the betting is unsuccessful due to the failure of the sales terminal, communication line and credit line of the betting station. , the amount of the bet will be refunded to the buyer.

Buyers can make multiple bets on the number of their choice, ranging from 2 times to 99 times. The maximum amount of a single lottery ticket shall not exceed $20,000. The sales of two-color balls are carried out as scheduled, three times a week, and the number of cycles is determined by the date of the lottery, which is arranged according to the calendar year.