Scarlett purchased five new mp3s. She has room to add only three more onto her mp3 player. How many possible combinations of songs can be added to her mp3 player?

A. 10

B. 20

C. 30

D. 60

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- Apr 4th 2007, 03:31 PMtotally-confusedFind number of combinations
Scarlett purchased five new mp3s. She has room to add only three more onto her mp3 player. How many possible combinations of songs can be added to her mp3 player?

A. 10

B. 20

C. 30

D. 60 - Apr 4th 2007, 03:43 PMJhevon
This will be P(5,3), that is the number of ways to choose 3 songs from 5, in some order

P(5,3) = 5!/(5-3)! = 60

see Probability for more info

EDIT: I think order counts here, so I changed C(5,3) to P(5,3)