To find the number of students who study at least one subject, we need to add up the number of students who study each subject individually and then subtract the number of students who study all three subjects.
Number of students who study physics = 31
Number of students who study chemistry = 26
Number of students who study biology = 16
Number of students who study at least one subject = (31 + 26 + 16) - 3
= 73 - 3
= 70 students.
In a class of47 student ,31 study physics ,26 study chemistry and 16 study Biology . 3study all the three subjects, 2 study chemistry and biology only and 6study Biology only
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