Question: A jeweler wants to display 20 different rings on a row of 5 display towers. On each tower, the rings are stacked one above

A jeweler wants to display 20 different rings on a row of

A jeweler wants to display 20 different rings on a row of 5 display towers. On each tower, the rings are stacked one above another. In how many ways can the display be arranged if the order of rings on each tower matters, and each tower can hold any number of rings, including zero?

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