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Can you tell me what ∑xy means? Like is in the sum of all x times y or what?

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asked by Carol
  1. the ∑ is the sigma symbol and stands for a summation.
    There is probably something like x = ? and y = ? below the symbol and a pair of numbers above it
    e.g.
    if it says x = 2, y=3 to whatever on top, then it would mean
    (2)(3) + (3)(4) + (4)(5) + ....

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    posted by Reiny
  2. Thanks so much!!!

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    posted by Carol

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