Keno is a lottery-like game whose variants can be played at a casino and are sometimes also offered as lotteries. The game originates from China even though the name itself originates from the Latin and French languages. According to folklore about the origins of the game, it saved a city in ancient China from plummeting into war and helped build the Great Wall of China from its winnings.
In Keno, players choose from the numbers 1 to 80 in most cases. A player picks 20 numbers and hopes to match at least 5 numbers to a list of numbers generated randomly. The house edge on the game is large and sometimes goes up to 35%.
The probability that a player will match all 20 numbers is incredibky unlikely to the point of being almost, and essentially, impossible. For a player to get all 20 numbers they would have to beat odds of a mind boggling 3.5 quintillion – (exactly 3,535,316,142,212,174,320 – 1).
Winning does not depend on any kind of strategy but simply luck when the random numbers come up. This is part of the fun since the big winners know that it has nothing to do with what strategy they used to pick their numbers and was simply good fortune. The chance of winning does, however, increase with more picks.