Question

There are 100 students in a class. In an examination, 50 of
them failed in Mathematics, 45 failed in Physics, 40 failed in
Biology and 32 failed in exactly two of three subjects. Only
one student passed in all the subjects. Then the number of
students failing in all the three subjects
(a) Is 12
(b) Is 4
(c) Is 2
(d) Cannot be determined from the given information
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Answer 1

may be Ans is dO:-):-\:-\:-\:'(:-D:-):-) because in this question 3rs subject is not given. i.e; chemistry