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I need to review Venn Diagrams

Posted: May 19th, 2013, 10:22 pm
by paul
I'm preparing for GMAT and I cannot understand the topic of venn diagrams. Kindly review this question by and help me understand it better.

If, in a certain school, 20 students study mathematics, 10 study science, and 7 study both, how many students study mathematics, science or both?

[Moderator edit: Link taken out]

Thank you for your time!!