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Re: Inconsistent behavior?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg87264] Re: Inconsistent behavior?
  • From: "Steve Luttrell" <steve at _removemefirst_luttrell.org.uk>
  • Date: Sun, 6 Apr 2008 06:41:19 -0400 (EDT)
  • References: <ft7ggo$bs3$1@smc.vnet.net>

Mathematica avoids expanding Binomial (and other functions) in cases where 
the resulting expression might be too long to be of interest. You can 
override this by using FunctionExpand.

Binomial[n, 6] // FunctionExpand

1/720 (-5+n) (-4+n) (-3+n) (-2+n) (-1+n) n

Stephen Luttrell
West Malvern, UK

"angela" <mpopyft at lycos.com> wrote in message 
news:ft7ggo$bs3$1 at smc.vnet.net...
> Binomial[n,4] yields
> 1/24 (-3+n) (-2+n) (-1+n) n
>
> Binomial[n,5] yields
> 1/120 (-4+n) (-3+n) (-2+n) (-1+n) n
>
> Binomial[n,6] yields
> Binomial[n,6]
>
> Binomial[n,7] yields
> Binomial[n,7]
>
> Is some setting doing this.
>
> Thanks;
> Angela
> 



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