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January 28, 2015

January 28, 2015

Posted by **Tracy** on Sunday, April 17, 2011 at 8:48pm.

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

- Math -
**bobpursley**, Sunday, April 17, 2011 at 8:58pm45 items, taken 9 at a time

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

orders: 9!

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