Monday

September 1, 2014

September 1, 2014

Posted by **ana** on Sunday, March 7, 2010 at 7:38pm.

- math -
**Damon**, Sunday, March 7, 2010 at 7:49pmcombinations of 2 out of 9

C(n,r) = n!/[(n-r)! (r!) ]

= 9! /[ 7! * 2! ]

= 9*8 *7! / [ 7! * 2]

=9*4

= 36

- math -
**Damon**, Sunday, March 7, 2010 at 7:53pmOr use Pascal's triangle

row 9 is

1 9 36 84 126 126 84 36 9 1

so r = 0 --> 1

r = 1 = 9 of course

r = 2 = 36

**Related Questions**

8th grade math - At Maryland Middle School, there are 9 mathematics classes. If ...

Grades - I need some help on calculating my current high school GPA. So far, I'...

math - For every girl taking classes at the martial arts school, there are 3 ...

Math - For every girl taking classes at the martial arts school, there are 3 ...

Math - for every girl taking classes at the school, there are 3 boys who are ...

Math - For every girl taking classes at the martial arts school, there are 3 ...

Math - Practice Dividing by 7 For each dance style , the Step - Up Dance School...

Math - At Smart Middle School students are required to take 7 classes each ...

math - 4. Gregory teaches martial arts. He charges a one-time processing fee of...

English Expressions - 1. The following is the bar graph showing the number of ...