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OpenStudy (anonymous):
Find the number of ways to listen to 4 CDs from a selection of 8 CDs. 1680 336 70 50
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OpenStudy (anonymous):
does the order matter?
OpenStudy (anonymous):
Yeah.
OpenStudy (anonymous):
then 8P4=8*7*6*5=1680
OpenStudy (anonymous):
u know the reason?
OpenStudy (anonymous):
we can choose the first cd in 8 ways, the next in 7 ways, the next in 6 ways and the last in 5 ways.. so, total 8*7*6*5=1680
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