Straight ticket betting is betting the numbers marked as a single wager. Despite this way of playing is very simple many players prefer to bet more combinations.
A king ticket bet is made when a player chooses a number which is used in all combinations marked.
A combination ticket bet is made when a player marks 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.
The probability of a player hitting all 20 numbers on a 20 spot ticket is approximately 1 in 3.5 quintillion.
After all the balls are drawn, the winners get their payouts, which are often quite different in different gambling houses. If you have, for example, a four-spot ticket, you are paid 1:1 if 2 numbers hit, 1:5 if 3 numbers hit and 1:120! if all the 4 numbers hit. 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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