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Overlapping sets formula with 3 three groups

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Overlapping sets formula with 3 three groups  [#permalink]

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New post 12 Sep 2016, 11:55
Hi,

Can anyone kindly verify if I have the correct formula for 3 groups venn diagram or not?

The groups are : A, B, C

Total unique participants= A + B + C - AB - BC- AB -2ABC + none of ABC

Thanks,
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Re: Overlapping sets formula with 3 three groups  [#permalink]

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New post 12 Sep 2016, 15:13
I've noticed on practice questions ( and I remember one question on the exam) where they give the number in both sets rather than a&b a&c. But yes I think of it as
g1+g2+g3-(number in both groups)-2(number in three groups)+neither=total
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Re: Overlapping sets formula with 3 three groups  [#permalink]

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New post 12 Sep 2016, 19:21
1
Thanks. I remember getting a 3 set question in my exam and I forgot to multiply the 'all the three groups' with 2.
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Re: Overlapping sets formula with 3 three groups  [#permalink]

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New post 13 Sep 2016, 01:20
ruggerkaz wrote:
Hi,

Can anyone kindly verify if I have the correct formula for 3 groups venn diagram or not?

The groups are : A, B, C

Total unique participants= A + B + C - AB - BC- AB -2ABC + none of ABC

Thanks,


You can find all information in the links below:


Hope it helps.
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Re: Overlapping sets formula with 3 three groups  [#permalink]

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New post 13 Sep 2016, 02:36
ruggerkaz wrote:
Hi,

Can anyone kindly verify if I have the correct formula for 3 groups venn diagram or not?

The groups are : A, B, C

Total unique participants= A + B + C - AB - BC- AB -2ABC + none of ABC

Thanks,
it's correct, but I did not memorize the formula, it's not hard to evaluate


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Re: Overlapping sets formula with 3 three groups  [#permalink]

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New post 24 Oct 2018, 18:20
2) Total = n(A) + n(B) + n(C) – n(A and B) – n(B and C) – n(C and A) + n(A and B and C) + n(No Set)

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Re: Overlapping sets formula with 3 three groups &nbs [#permalink] 24 Oct 2018, 18:20
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