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Math Help - summation problem

  1. #1
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    summation problem

    hi guys,is there a closed formula for the following sort of expression
    ( sigma from 1 to n)( sigma from 1 to j=n)( sigma from 1 to i=j)....x
    the phrases in brackets should be substituted by sigma symbols described.Thanks for any help.
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  2. #2
    Math Engineering Student
    Krizalid's Avatar
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    Santiago, Chile
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    Quote Originally Posted by dynamo View Post
    hi guys,is there a closed formula for the following sort of expression
    ( sigma from 1 to n)( sigma from 1 to j=n)( sigma from 1 to i=j)....x
    What does x\ldots stand for?
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  3. #3
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    Joined
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    x is what gets incremented

    x is what gets incremented.For instance it starts out at x=1 then x=2 then x=3 when we have summation of x from x=1 to n.my question is equivalent to the following loop
    for(int i=1;i<n;i++){
    for(j=1;j<i;j++){
    for(k=1;k<j;k++){
    .
    .
    .
    x=x+1;
    .
    .
    .
    }
    }
    }
    thankx.
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