Binomial theorm

  • Thread starter fork
  • Start date
  • #1
23
0
Hello, everybody,

I know how to get the first step, but I don't know how can the first step be changed to the format of the final answer, can anyone help?

Thanks.:rofl:
 

Attachments

Answers and Replies

  • #2
172
2
How many terms are in the product "(-4)(-5)...(-4-r+1)"? How can this product be combined with (-1)^r?

Also, writing out r! as a product of consecutive integers should help.
 
  • #3
HallsofIvy
Science Advisor
Homework Helper
41,833
956
Interesting! I was wondering how that r! in the denominator magically became 6.

My suggestion (in fact what I did) is calculate both formulas for r= 1, 2, 3, 4, 5,... and see what happens.
 

Related Threads on Binomial theorm

Replies
1
Views
2K
  • Last Post
Replies
2
Views
2K
Replies
1
Views
670
  • Last Post
Replies
7
Views
2K
  • Last Post
Replies
6
Views
2K
  • Last Post
Replies
14
Views
837
  • Last Post
Replies
1
Views
1K
  • Last Post
Replies
6
Views
5K
Replies
7
Views
121
  • Last Post
Replies
5
Views
1K
Top