1. Two-color ball is a game of China Welfare Lottery. China welfare lottery "two-color ball" is a kind of "lottery-type" welfare lottery which is uniformly organized and distributed by China Welfare Lottery Distribution Management Center and sold nationwide. Since February 16, 2003, it has been sold on the national network. The betting methods of "two-color ball" can be divided into self-selected number betting and machine-selected number betting; Its betting methods include single betting and double betting. Single bet is to select 6 numbers from the red ball number and 1 number from the blue ball number to form a betting number. Two-color ball duplex type: red ball number duplex type: select 7-0 number from red ball number and 1 number from blue ball number to form one-note multi-note number. Blue ball number multiple: select 6 numbers from the red ball number and 2- 16 numbers from the blue ball number to form a bet with multiple bet numbers. Full compound: select 7-20 numbers from the red ball number and 2-6 numbers from the blue ball number to form a bet with multiple betting numbers.
2. Each note of two-color ball is a combination of six red balls and 1 basketball, and two notes are a combination of two such numbers. Two bets on the two-color ball are to buy the two-color ball number. One note is to buy 1 note the two-color ball number. When betting, choose 6 red ball numbers and 1 blue ball numbers to make a single bet, and the amount of each bet is RMB 2 yuan. Two-color ball betting is divided into red ball number area and blue ball number area. The red ball number area consists of 33 numbers 1-33, and the blue ball number area consists of 16 numbers 1- 16. Buyers can choose the machine-selected number to bet, or they can choose their own number to bet. Machine-selected number betting means that the betting machine randomly generates betting numbers for betting, and self-selected number betting means that the number selected by the buyer is entered into the betting machine for betting.