Venn Diagram Formula
Here is an Venn diagram applied in math formula. If these three circles are A, B, and C. From this Venn diagram, we can see the numbers related only to A is a-(w+y-z), B is equal to b-(w+x-z), C is c-(y+x-z). Then, as for the elements related to (A and B) is w-z, (B and C) is x-z, (A and C) is equal to y-z, all three sets is equal to z. So, the formula for all three sets is [a-(w+y-z)]+[b-(w+x-z)]+[c-(y+x-z)]+(w-z)+(x-z)+(y-z)+z. Following this formula, the results for this kind of math problems will be easy to get.
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