Question

In a survey of 400 students of a college it was found that 240 study mathematics, 180 study Statistics and 140 study Accounts, 80 study mathematics and Statistics, 60 study Statistics and Accounts, 100 study Accounts and mathematics and 40 study none of these subjects. On the basis of this information answer the following questions.

Find the number of students who study at least one of these subjects.
Find the number of students who study all of these subjects

Answer 1

apply (aubuc)=pm+pa+ps-p(anm)-p(mns)-p(sna)+p(ansnm)

360=240+180+140-80-60-100+p(ansnm)

people who study all is 40