Question

there are 100 students in a class. in an examination 50 of them failed in maths, 45 failed in physics, and 40 failed in statistics ; and 32 failed in exactly two of the three subjects. only one student passed in all three subjects. find the number of students failed in all the three subjects? ​

Answer 1

Answer:

The total number of student =100

Number of student fail in Maths=50

Number of student fail Physics=45

Number of student fail in statistics=40

Number of student fail in 2of3 subject =32

Number of student pass=1

Number of student fail in all three subject= (50+45+40+32+1)-100

168-100

=68