Q2 of 5 Page 24

In an exam 80% of the students passed in Eng, 85% in Math and 75% in both. If 40 students failed in both subjects. What is the total number of students?

Formula:- n(A∪B) = n(A) + n(B) - n(A∩B)


Let x be total number of student


Given:-


n(A) = number of students pass in English


n(B) = number of students pass in math


n(A∩B) = number of students pass in both


40 = number of students falied in both subject .


n(A∪B) = n(A) + n(B) - n(A∩B)




So, number of students failed in both either math or english = x - n()




x = 400


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