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I have a question about a class of 30 students, everyone has either a pierced nose or a pierced ear. The professor asks everyone with

I have a question about a class of30students, everyone has either a pierced nose or a pierced ear. The professor asks everyone with a pierced nose to raise his or her hand.Ninehands go up. Then the professor asked everyone with a pierced ear to do likewise. This time there are23hands raised.

Does anyone know how many students have piercings both on their ears and their noses =

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