Well, its easy to get frequencies from the Wizard of Odds Keno Calculator. But from scratch I use the John Scarne method.
First we determine the total number of combinations that make a 5-spot out of 80 numbers:
80X79X78X77X76/5X4X3X2X1 = 24,040,016
Then we have to determine the number of combinations that make 3 out of 5:
(20X19X18/3X2X1) * (60X59/2X1) = 2,017,800
Then we divide the total combinations by the combinations that make 3 out of 5:
24,040,016/2,017,800 = 11.91
If you check the Wiz's keno calculator you will see that he has the same number.
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Posted by: mickeycrimm@yahoo.com
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