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Re: Inconsistent behavior?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg87263] Re: [mg87243] Inconsistent behavior?
  • From: Bob Hanlon <hanlonr at cox.net>
  • Date: Sun, 6 Apr 2008 06:41:08 -0400 (EDT)
  • Reply-to: hanlonr at cox.net

It tries to keep the output to a reasonable length. If you want it expanded, use FunctionExpand.

Binomial[n, 6] // FunctionExpand

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

Binomial[n, 7] // FunctionExpand

((n - 6)*(n - 5)*(n - 4)*(n - 3)*
      (n - 2)*(n - 1)*n)/5040


Bob Hanlon

---- angela <mpopyft at lycos.com> wrote: 
> 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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