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26 Jul 2016, 22:27
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devbond
M, S and V in the formula are values including intersections.
"20 are on the marketing team, ... 5 workers are on both the Marketing and Sales teams"
These 5 are a part of the 20.
In this formula:
\(Total = A + B + C- (sum \ of \ 2 \ group \ overlaps) + (all \ three) + Neither\)
A, B and C include intersections. They represent the whole set.
15 Jul 2018, 23:45
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alexjoh89
Never try to memorize the formula! Always try to find the rationale behind any problem in both verbal and math. In these--overlapping set problems, the relatively tricky part is to understand what overlaps what. Precisely, when you draw the diagrams, understand what part overlaps and what part not.
For example, in this question, when the author says that 4 members are on three teams, you should understand that there can be members who are both in two teams and in three teams. When you think in that way, you eliminate the additional overlaps and find the real number of team members.
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Sourav700
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07 Jun 2019, 22:08
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There are two formulas for 3 overlapping sets:
Total=A+B+C−(sum of 2−group overlaps)+(all three)+NeitherTotal=A+B+C−(sum of 2−group overlaps)+(all three)+Neither.
Total=A+B+C−(sum of EXACTLY 2−group overlaps)−2∗(all three)+NeitherTotal=A+B+C−(sum of EXACTLY 2−group overlaps)−2∗(all three)+Neither.
Alright, I'm really really confused on this topic. I'd really appreciate if someone could help me understand the difference between the two.
Bunuel VeritasKarishma IanStewart chetan2u
Total=A+B+C−(sum of 2−group overlaps)+(all three)+NeitherTotal=A+B+C−(sum of 2−group overlaps)+(all three)+Neither.
Total=A+B+C−(sum of EXACTLY 2−group overlaps)−2∗(all three)+NeitherTotal=A+B+C−(sum of EXACTLY 2−group overlaps)−2∗(all three)+Neither.
Alright, I'm really really confused on this topic. I'd really appreciate if someone could help me understand the difference between the two.
Bunuel VeritasKarishma IanStewart chetan2u
