Find the number of ways to listen to four CDs from a selection of 8 CDs

Algebra
Tutor: None Selected Time limit: 1 Day

A.1680 B.336 C.70 D.50

Jun 18th, 2015

Thank you for the opportunity to help you with your question!

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.

Please let me know if you need any clarification. I'm always happy to answer your questions.
Jun 18th, 2015

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