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# Overlapping sets formula with 3 three groups

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Intern
Joined: 13 Jan 2016
Posts: 46
GMAT 1: 710 Q47 V40
Overlapping sets formula with 3 three groups  [#permalink]

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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,
Current Student
Joined: 26 Jan 2016
Posts: 103
Location: United States
GPA: 3.37
Re: Overlapping sets formula with 3 three groups  [#permalink]

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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
Intern
Joined: 13 Jan 2016
Posts: 46
GMAT 1: 710 Q47 V40
Re: Overlapping sets formula with 3 three groups  [#permalink]

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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.
Math Expert
Joined: 02 Sep 2009
Posts: 52285
Re: Overlapping sets formula with 3 three groups  [#permalink]

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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.
_________________
Current Student
Joined: 24 Jul 2016
Posts: 80
Location: United States (MI)
GMAT 1: 730 Q51 V40
GPA: 3.6
Re: Overlapping sets formula with 3 three groups  [#permalink]

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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

Sent from my iPhone using GMAT Club Forum mobile app
Intern
Joined: 20 Aug 2016
Posts: 49
GMAT 1: 570 Q46 V23
GMAT 2: 610 Q49 V25
GMAT 3: 620 Q45 V31
WE: Information Technology (Other)
Re: Overlapping sets formula with 3 three groups  [#permalink]

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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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# Overlapping sets formula with 3 three groups

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