In Keno there are 80 balls numbered from 1 to 80 and 20 are

In Keno, there are 80 balls numbered from 1 to 80, and 20 are drawn at random. If you play a double number, you win if both numbers are chosen. This bet pays 11 to 1, and you have very close to a 6% chance of winning. If you play 100 times and stake $1 on a double-number each time, you net gain will be around _____, give or take _____ or so.

Solution

If you play 100 times and stake $1 on a double-number each time, you net gain will be around _____, give or take _____ or so.

you net gain will be around 100*0.06 = $6*11 = $66