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bug in Mathematica?

• To: mathgroup at smc.vnet.net
• Subject: [mg122657] bug in Mathematica?
• From: "Hansruedi Widmer" <widmer at baden.ch>
• Date: Fri, 4 Nov 2011 06:03:54 -0500 (EST)
• Delivered-to: l-mathgroup@mail-archive0.wolfram.com

Hi Everyone


The code

Sum[Binomial[m, j], {j, 1, m - 1}]

produces the correct value -2+2^m.


But the code

Product[Binomial[m, j], {j, 1, m - 1}]

creates the wrong value of zero. Does anyone have an explanation for why 
this is happening?


Thanks and best regards

Hansrued Widmer

• Follow-Ups:
  • Re: bug in Mathematica?
    • From: Andrzej Kozlowski <akoz@mimuw.edu.pl>