On the TV show Deal or No Deal they often refer to a player having the same amount of money in their box as the previous day.
There are 22 players on each program who all have a different amount of money in their box from the other 21 players. On each program there is always one new player who was not on the previous day's program.
So what is the probability that at least one player on a program has the same amount of money as the previous day?
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