How can you accomplish this?
You are having a party on your back lawn. There are twelve guests present. You have twelve rolls in a basket and wish to give one to each guest. At the same time you want to have one left in the basket. How can you accomplish this?
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Hand the last roll to a guest while it is still in the basket.
The engineering department was arranging for a rather expensive catered lunch to bid farewell to their retiring colleague. They calculated that it would cost each person $30. One good mathematician remarked, "It's lucky that there aren't five fewer of us to split the...