when i make the double matrix table for this question "not x and not y" does not add up assuming total 100 students.
Brent@GMATPrepNow wrote:Incidentally, if anyone is wondering what the diagrams in mevicks' and theCodeToGMAT's solutions mean, they are using a technique known as the Double Matrix Method. This technique can be used for most questions featuring a population in which each member has two characteristics associated with it.
Here, we have a population of applicants, and the two characteristics are:
- applied to college X or didn't apply to college X
- applied to college Y or didn't apply to college Y
To learn more about this technique, watch our free video: https://www.gmatprepnow.com/module/gmat- ... ems?id=919
Then try these additional practice questions that can be solved using the Double Matrix Method:
- https://www.beatthegmat.com/mba/2011/05/ ... question-1
- https://www.beatthegmat.com/mba/2011/05/ ... question-2
- https://www.beatthegmat.com/mba/2011/05/ ... question-3
- https://www.beatthegmat.com/ds-quest-t187706.html
- https://www.beatthegmat.com/overlapping- ... 83320.html
- https://www.beatthegmat.com/finance-majo ... 67425.html
- https://www.beatthegmat.com/ds-french-ja ... 22297.html
- https://www.beatthegmat.com/sets-t269449.html#692540
- https://www.beatthegmat.com/in-costume-f ... tml#692116
Cheers,
Brent
