Betting the numbers marked as a single wager is called betting a straight ticket. Many players like to bet more combinations though it is the simplest way to play.
If a chosen number is used in all combinations marked it is called the king and a king ticket bet is made this way.
If you want to make a combination ticket bet you should mark several number groupings and plays combinations of them.
Keno payouts are based on how many numbers the player choses and how many numbers are "hit", multiplied by the proportion of the player's original wager to the “base rate” of the paytable. Typically, the more numbers a player chooses and the more numbers hit, the greater the payout, although some paytables pay for hitting a lesser number of spots.
Your chances to choose all 20 numbers correctly are 1 in 3.5 quintillion.
After the 20 numbers are drawn, winning tickets are paid according to a table that varies from house to house. For example, a four-spot ticket with wagered might return the if two numbers hit, bring if three numbers hit, and pay 0 if all four come in. But in another casino, the three-number hit might pay and all four 5, and in another the payoffs might be and 0. Because of the variation, no payback percentage is common enough to be called average.

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