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Tom's new CD player has a 9-disc changer. If she owns 45 CDs, in how many ways can he choose 9 CDs to listen to?

After picking 9 CDs, in how many ways can he order them in the 9 slots of the changer?

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45 items, taken 9 at a time

C(45,9)=45!/9!(45-9)!

orders: 9!

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