Posted by **betty r** on Thursday, May 3, 2007 at 2:12am.

if you have 6 books how many groups of four different books can you make out of the six?

If we assume that the order we choose those four books doesn't matter then it is

_{n}C

_{r}=

6!/(2!4!)

= ?

Isn't it 6*6*6*6???

## Answer This Question

## Related Questions

- math! - george entered a function into his calculator andfound the following ...
- check! - Write a recursive formula that generates the terms of the following...
- chemistry - I was way off on the other problem. But I see how you got the answer...
- man alive! can someone check for me? - I am so bad when it comes to mathI I ...
- Math - If there is a recursively defined sequence such that a1 = sqrt(2) an + 1...
- alg2 (sequences) - how do i find the pattern for: -4,8,-12,16 if the last number...
- Calculus - A baseball, hit 3 feet above the ground, leaves the bat at an angle ...
- Statistics - Consider pairs <x,y>,...,<xn,yn> for i=1, ...,n. zi=cxi...
- chemistry - If, for a second-order reaction, the elapsed time after the first ...
- science(chem) - CH3CHClCH2Cl vs. CH2ClCHClCH3 How would I know if : -The two ...

More Related Questions