Mathematics, 26.02.2021 14:00 rainyfallaw

In a class of 40 students, everyone has either a pierced nose or a pierced ear. the professor asks everyone with a pierced nose to raise his or her hand. seven hands go up. then the professor asked everyone with a pierced ear to do likewise. this time there are 36 hands raised. how many students have piercings both on their ears and their noses?

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In a class of 40 students, everyone has either a pierced nose or a pierced ear. the professor asks e...