A Nevada roulette wheel has 38 pockets. One is numbered 0, another is numbered 00, and the rest are numbered from 1 through 36.Except for 0 and 00, which are colored green, the numbers on the roulette wheel alternate red and black. One bet is on a number. If you bet a dollar on a number and the number comes up, you get the dollar back together with $35 dollars in winnings. If a different number comes up, you lose your dollar. The box model for this problem is as follows: The box contains tickets numbered +$35 and tickets numbered -$. Suppose you play roulette 50 times, betting a dollar on the number 7 each time. Your net gain is like the sum of draws from the box described above.

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