Posted by **Tiff** on Friday, June 12, 2009 at 10:30pm.

It's been so long since I've donw combinations, and now I have a question about them in my algebra homework packet. Question is....Marcie has a collection of 9 DVDS. She will choose 4 of them to take in the car to watch during a long trip. How many combinations of 3 DVDS can Marcie take from her collection ? 504, 252, 168, or 84 ?

- Algebra -
**drwls**, Friday, June 12, 2009 at 10:43pm
Please clarify if she is taking 3 or 4. You say both numbers.

If she is taking 4, the answer is

9!/(4!*5!) = 9*8*7*6/(1*2*3*4)

= 9*8*7/4 = 126

If she is taking 3, the answer is

9!/(3!*6!) = 9*8*7*6/3! = 9*8*7 = 504

## Answer this Question

## Related Questions

- chemistry - i have a homework packet that i am struggling with can you please ...
- Algebra I - So- im trying to help my little brother out with his Algebra- but ...
- Algebra - Hi jiskha! I was wondering if anyone could answer this ~fun~ question...
- algebra - Bob is going to China, and he wants to bring some DVDs on the airplane...
- Math - How long can I wait to see the answer of my question about Algebra ? Its ...
- algebra - At a local ice cream shop, you can choose from a collection of 18 ...
- algebra - At a local ice cream shop, you can choose from a collection of 16 ...
- Algebra - Solve using the appropriate method. Substitution or Elimination. y = ...
- math (college algebra) - Ok I have two questions I have NO CLUE how to complete ...
- Linear Algebra 2 question - Hello, I have another question from my linear ...