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Math Help - set formulas

  1. #1
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    set formulas

    let A,B,C be arbitrary subsets of the finite set X. Illustrate this formula with an example or explain with a digram...how could i use a diagram to show this..some sort of venn?

    |A U B U C|=|A| +|B| + |C|-|A and B| -|A and C| - |B and C| + |A and B and C|

    thanks.
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  2. #2
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    This is the addition rule for 3 events.

    Here is an example and a diagram:

    P(A)=.20, P(B)=.50, P(C)=.30, P(A and B)=.15, P(A and C)=.13

    P(B and C)=.20, P(A and B and C)=.10

    You can use the formula to get .62

    From the diagram you can see the respective events.
    Last edited by galactus; November 24th 2008 at 06:38 AM.
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  3. #3
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    Here is a pdf file to show you how its works.
    Use the 'arrow keys' to page thru the document.
    Note that the "+'s" indicate how often a region is counted.
    Attached Files Attached Files
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