Wednesday

April 23, 2014

April 23, 2014

Posted by **rawr... im a dinosaur.... rawr** on Thursday, October 18, 2012 at 3:36am.

45?

- Algebra Grade 7 -
**Damon**, Thursday, October 18, 2012 at 5:01amcombinations of ten taken two at a time:

10!/[(2!)(8!)] = 10*9/2 = 5*9 = 45

- Algebra Grade 7 -
**Damon**, Thursday, October 18, 2012 at 5:02amGrade 7 ????

- Algebra Grade 7 -
**Damon**, Thursday, October 18, 2012 at 5:06amI am trying to think how I would have done this in grade 7. I assume you have not had permutations, combinations and factorials.

make a table of combinations

first person shakes hands with 9 --> 9 projects

second with 8 --> 8 more

third with 7 --> 7 more

etc

9+8+7+6+5+4+3+2+1 = 45

**Related Questions**

Probability Math - A committee of four students will be selected from a list ...

math PLEASE HURRY - there are 24 students in a science class. Mr. Sato will ...

algebraic expressions - there are 24 students in a science class. Mr. Sato will ...

11th grade - The students of litchfield High school are in grades 9,10,11,12. Of...

english - Write S if the sentence is simple .Write C if the sentence compound. 1...

Algebra - Ms Newton's class took the same test as Mr. Euclid's students. Ms. ...

Algebra - Ms Newton's class took the same test as Mr. Euclid's students. Ms. ...

Algebra - Mr. Green teaches band, choir, and math. This year, he has 57 students...

math - Mr. Mole determined that 2/3 of the students in his math class had ...

math! - IN MR.MAROLE'S CLAOF THE STUDENTS TAKE MUSICSS, THREE FOLESSONS.THAT IS...