In a store 6 different CDs are there. If John can buy 2 CDs,

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In a store 6 different CDs are there. If John can buy 2 CDs, how many cases that he can buy are there?
A. 12
B. 15
C. 18
D. 21
E. 24

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by Max@Math Revolution » Wed Jun 22, 2016 7:38 pm
6C2=(6*5)/2!=15. Hence, the correct answer is B.