Mathematics, 01.01.2022 16:40 carlo123

There are 22 students in a class. 15 of these students study Physics (p) and 17 study Chcinistry (C). 3 study neither Physics nor Chemistry. Find the number of students who study both Physics and Chemistry. the final answer is 13 and i cannot understand it pls help.

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There are 22 students in a class. 15 of these students study Physics (p) and 17 study Chcinistry (C)...

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