A.1680 B.336 C.70 D.50
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This is a permutation problem. You much choose 4 CDs from 8 CDs, BUT every time you choose a CD, there is one less CD for the next choice. So... 1st Choice = 8 CDs 2nd Choice = 7 CDs 3rd Choice = 6 CDs 4th Choice = 5CDs Therefore, the answer is 8 x 7 x 6 x 5 = 1680.
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