mupad: n choose k?

Markus Dehmann · science forum beginner Joined: 29 Mar 2006 Posts: 1

Does anyone know how to do n choose k in mupad? I couldn't find it, not
even in the combinat package.

Thanks,
Markus

Joe Riel · science forum beginner Joined: 22 Jun 2005 Posts: 19

"Markus Dehmann" <markus.dehmann@gmail.com> writes:

Mark Lawton · science forum beginner Joined: 22 Mar 2006 Posts: 11

You can write your own functions. I don't know how to do this in Mupad,
but here's a Maxima example:

Define a "combinations" function
(%i6) c(x,y) := x!/((x-y)! * y!);
(%o6) c(x,y):=x!/((x-y)!*y!)

Use it to calculate the number of ways to select 6 from 49 where the
order is not important (which equates to the odds of winning a
"Canadian style" lottery)
(%i7) c(49,6);
(%o7) 13983816

See
http://en.wikipedia.org/wiki/Permutations_and_combinations#Summary_of_formulae
for other combinatorical formulae.

Markus Dehmann wrote:

Brad Cooper · science forum beginner Joined: 07 May 2005 Posts: 48

"Markus Dehmann" <markus.dehmann@gmail.com> wrote in message
news:1143604309.689537.226230@e56g2000cwe.googlegroups.com...

Jay Belanger · science forum beginner Joined: 12 Sep 2005 Posts: 13

Joe Riel <joer@k-online.com> writes:

Google