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Comment on 3-Criteria Venn Diagrams
Thank you sir, your
This question type is a real
This question type is a real time-killer. Fortunately, they are exceedingly rare on the GRE.
I suppose another easiest
As we are given that: Total number of students, say T = 100.
Similarly, using symbols P,S and M to denote the number of physics, sociology and Music students respectively.
We have,
n(P) = 40, n(S) = 60, n(M) = 80.
Also,
n(PnS) = 7, n(SnM) = 46, n(PnM) = 36 and n(PuSuM) = 100.
now applying the venn diagram rule for 3 sets we get,
n(T) = n(P) + n(S) + n(M) - n(PnS) - n(SnM) - n(MnP) + n(PnSnM) + Complement of n(PuSuM)
Now, plugging in the corresponding values we get,
100 = 40 + 60 + 80 - 7 - 46 - 36 + 6 + (no. of students taking none of the courses)
Solving, we have-
The number of students taking none of the courses to be 3.
could you give an answer to
I'm getting D, since based on which subjects overlap, the # of students taking french could be above or below 14.
You'll find you get 14
You'll find you get 14 students taking French no matter how you arrange the overlapping students.
Here's my full solution: https://gre.myprepclub.com/forum/in-a-class-of-25-students-each-student-...