Question

A group of students were preparing for exams. Out of them, 20 were good in physics, 25 were good in mathematics and 30 were good in chemistry. 12 were good in chemistry and physics, 15 were good in mathematics and physics and 13 were good in chemistry and mathematics whereas 8 were good in every subject. Find the no of students good in Exactly 2 subject

Answer 1

Answer:

answer is 23

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