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Moon
Lv 7
Moon asked in Science & MathematicsMathematics · 9 years ago

Mathematics - Is there a sign for ............. ?

We have a sign for continuous multiplication (!) called factorial

e.g. 1 x 2 x 3 x 4 x 5 = 5! or n!

Is there a sign for continuous addition ......... too and its nomenclature?

e.g. 1 + 2 + 3 + 4 + 5 = 5(?) or n(?)

Thanks in advance.

3 Answers

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  • ?
    Lv 7
    9 years ago
    Favorite Answer

    Σ(i)

    for 1 to 5 you write

    below the capital sigma you write "i = 1"

    above the capital sigma you write "5"

    note Σ(i) for i=1 to n = (n/2)(n + 1)

  • Anonymous
    9 years ago

    Just do this let's say you had 20393 as your number 1+20393=20394*20393/2. So

    (X+1)*(X/2) You have too round the division down as well.

  • John Paul Emmanuel
    9 years ago

    none, but you can use sigma

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