MathGroup Archive 2012

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Sum of Products

  • To: mathgroup at
  • Subject: [mg126661] Sum of Products
  • From: "Harvey P. Dale" <hpd1 at>
  • Date: Tue, 29 May 2012 05:48:34 -0400 (EDT)
  • Delivered-to:

	If I have a list and want to sum the products of each possible
grouping of two elements in the list, this program will do that:

		Total[Times @@@ Subsets[{a, b, c}, {2}]]

Is there any other, shorter, built-in Mathematica object that will
produce the same result?



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