Question: how to calculate the probability of keno?
Answer: When figuring two numbers, the player must draw 2 out of the 20 drawn numbers to win. You figure out the total combinations—combin(80,2) = 3160—and then figure out how many winning combinations there are—combin(20,2) = 190. You then divide the numbers, 190/3160. The probability of winning is 6.01 percent.