Answer: Student is chosen randomly than probability of every student is same to chosen = 
Step-by-step explanation:
No of student = 100
Let A denote Math class , B denote Physics class , C denote Chemistry class
n(A) = 28 , n(B) = 26 , n( C)= 16
Student both in math and physics class = 
Student both in math and chemistry = 
Student both in physics and chemistry = 
Student taking all classes = 
Student is chosen randomly than probability of every student is same to chosen
probability of 1 student being chosen = 
student is chosen randomly then probability of student he or she not taking any classes
but from the Venn diagram the probability is = 





