Re: binomial sum bug

*To*: mathgroup at smc.vnet.net*Subject*: [mg82592] Re: binomial sum bug*From*: Peter Breitfeld <phbrf at t-online.de>*Date*: Fri, 26 Oct 2007 05:10:04 -0400 (EDT)*References*: <ffpq7m$lf7$1@smc.vnet.net>

Jack Kennedy schrieb: > In: Sum[Binomial[5,2k],{k,0,5}] > Out: 16 > > In: Sum[Binomial[n,2k],{k,0,n}] /. n->5 > Out: -16 > > What the? > > This has been addressed before > about a year ago and a work around was posted > but I have two questions: > > 1. Was it declared a bug by Wolfrram, and > 2. In general does Wolfram issue bug fixes, and specifically is there > a patch for this problem? > > $Version = 5.1 for Microsoft Windows (October 25, 2004) > > Regards, > Jack Kennedy In Version 6 your second input gives 16 (right) but takes some time. Gruss Peter -- ==-==-==-==-==-==-==-==-==-==-==-==-==-==-==-==-==-==-==-==-==-== Peter Breitfeld, Bad Saulgau, Germany -- http://www.pBreitfeld.de