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bug in Mathematica?

  • To: mathgroup at
  • Subject: [mg122657] bug in Mathematica?
  • From: "Hansruedi Widmer" <widmer at>
  • Date: Fri, 4 Nov 2011 06:03:54 -0500 (EST)
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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

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