Q. In an examination, question 1 was attempeted by 67 students, question number 2 by 46 students and question number 3 by 40 students. 28 students attempted both questions number 1 and 2, 8 attempted both question numbers 2 and 3. 26 attempted both question numbers 1 and 3 and 2 students attempted all the three questions. Find how many attempted question number 1 but not 2 and 3 ?

Hi!
Here is the answer to your question.
 
Let A denote the set of students who attempt question 1.
Let B denote the set of students who attempt question 2.
Let C denote the set of students who attempt question 3.
 
 
Thus, the number of students who attempted question 1 but not 2 and 3 is 15.
 
Cheers!

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