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Mathematics, 19.03.2021 20:20 gonzalesnik

A computer user has downloaded 19 songs using an online file-sharing program and wants to create a CD-R with 9 songs to use in his portable CD player. If the order that the songs are placed on the CD-R is not
important to him, how many different CD-Rs could he make from the 19 songs available to him?
There are
possible CD-R's.

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