600$

20 Spots 0 Hits: 1 In 843.380 Or 0.11857057%

3. The number of ways in which the remainder of the numbers do not occur in the twenty numbers selected is given by the number of ways in which 20-k numbers can be chosen from a set of 80-n numbers.
Combining the foregoing, one finds that:

The payouts for each result can be read from the Maryland keno Web site. For the purposes of our discussion, if the player participates in the n-spot game and ends up matching k of the twenty numbers selected, we will refer to that payout as:
Wn(k).