Overlapping Sets - idea is not clear

[BernardK777]

priyankur.saha wrote:
Thank you very much. Nice explanation Emily.

1. Because common sets include workers on X and Y only AND workers on X, Y, and Z, substraction of common sets is removing values of "All three" sets. Therefore "All three" part should be an addition (+ all three).
2. Because common sets include two-club only students, substraction of common sets is NOT removing duplicate values of "All three" sets. Therefore, twice of "All three" part should be substracted.

I think it's clear now...... :-)
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I was not able to follow her reasoning unfortunately. Can someone elaborate / specify her findings. Thanks

[RonPurewal]

Hi,
First, that discussion is more than five years old. Second, "I didn't understand what she wrote" is impossible to answer effectively, because it's not specific.

So that we can help you out here, please ...
... ask a SPECIFIC question
... let us know some details about YOUR current understanding. What do you understand? What don't you understand? Etc.

Thanks.