Question

7. Out of 80 students who appeared in a combined test in scinece and
Mathematics, 64 passed in at least one subject. If 45 passed in science
and 52 in maths then number of students failed in maths only is
1)12
2) 28
31133
4) 24​

Answer 1

answer in option

2)

Step-by-step explanation:

yes 28 is the answer

Answer 2

number of students failed in maths =19

Step-by-step explanation:

(A ∪B) = 64    n(A) = 45     n(B) = 52 then;

n(A ∩ B) = n(A) + n(B) - n(A ∪ B)

               = 45 + 52 - 64

                = 33

n(B) = n(A - B) + n(A ∩ B) ⇒

52 = n(A - B) + 33

n(A - B) = 19