Suppose you are going to Las Vegas to play Keno. Your favorite bet is a dollar on a single number. When you win, they give you the dollar back and two dollars more. When you lose, they keep the dollar. There is 1 chance in 4 to win. The box model for this problem is as follows: The box contains 1 ticket numbered +$ and tickets numbered -$. Suppose you play Keno 100 times, betting a dollar on a number each time. Your net gain is like the sum of draws from the box described above.  Suppose you play 5 times, betting a dollar on a number each time. Suppose the results of the 5 plays are as follows: win, win, lose, lose, win. Your net gain is +$.

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