A lottery-like or bingo-like gambling game played at modern casinos is called keno. There is a circular glass enclosure called a "bubble" containing 80 ping pong-like balls which determine the balldraw result in keno. Each ball is imprinted with a number 1 through 80. During the balldraw, a blower pushes air into the bubble and mixes the balls. A lever opening a tube is pressed by a "caller" and then the balls lift one at a time into a "V" shaped tube called the "rabbit ears". The caller and a "verifier" record each of 20 balls drawn, and the computerized keno system calculates all wagers based on the numbers drawn.
Players mark an "X" over the "spot" choices on a blank keno ticket form containing numbers from 1 to 80. 20 balls at random are drawn only after the players wagers are placed.
"Paytables" are series of pay scale choices that are set by the casino. The player is paid based on how many numbers drawn match the numbers selected on the ticket and according to the paytable selected with regard to the wager amount. There is a wide range of keno paytables from casino to casino and a large deviation in the house edge set for each of those paytables. One can hardly find two absolutely identical keno paytables.
The house edge ranges from less than 4% to 66%.

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