Re: binomial sum bug

*To*: mathgroup at smc.vnet.net*Subject*: [mg82637] Re: binomial sum bug*From*: Bill Rowe <readnewsciv at sbcglobal.net>*Date*: Fri, 26 Oct 2007 05:33:13 -0400 (EDT)

On 10/25/07 at 6:06 AM, jack at realmode.com (Jack Kennedy) wrote: >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 [mg70486] 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) Given: In[1]:= Sum[Binomial[5, 2 k], {k, 0, 5}] Out[1]= 16 In[2]:= Sum[Binomial[n, 2 k], {k, 0, n}] /. n -> 5 Out[2]= 16 In[3]:= $Version Out[3]= 6.0 for Mac OS X PowerPC (32-bit) (June 19, 2007) It is clear it was a bug that has been corrected. -- To reply via email subtract one hundred and four