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Overlapping Sets

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Overlapping Sets [#permalink] New post 11 Sep 2009, 14:25
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A
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Hi i need Help with overlapping sets questions.
I can seem to figure out for 3 subgroups A B C when a problem says 30 belong to A and B if this means:
a) that 30 belong only to A and B
b) of those 30, 30 -x belong to only A and B and x to A, B and C.

Some else have the same doubt or its just me?

I can remenber know the exact problems but i am sure i have seen both interpretations.
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Re: Overlapping Sets [#permalink] New post 13 Sep 2009, 15:57
MatiasMM wrote:
Hi i need Help with overlapping sets questions.
I can seem to figure out for 3 subgroups A B C when a problem says 30 belong to A and B if this means:
a) that 30 belong only to A and B
b) of those 30, 30 -x belong to only A and B and x to A, B and C.

Some else have the same doubt or its just me?

I can remenber know the exact problems but i am sure i have seen both interpretations.


From the statement " 30 belong to A and B" sounds to me as AnB, which in a 3 sub group sets includes a small portion AnBnC as well.

:roll:
Re: Overlapping Sets   [#permalink] 13 Sep 2009, 15:57
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