void wrote:
another explanation for above question please
Hi There!
Let me try helping you!
Students who study course A (This includes only A, A& B, A& C & A,B & C)=450
Students who study course B= 300
Students who study course=150
Now, as we know the 100 students who study all the 3 subjects will be included in the above students and they will be counted thrice i.e. once in A, B & C. Therefore we can subtract this from all the three
A(This includes only A, A& B, A& C )450-100=350
B=300-100=200
C=150-100=50
Now the above values are those values which includes individual and two courses together.
Total students=500
350+200+50+100=700
700-500=200
Thus, there has to be 200 students combined (A& B, B& C, A& C)
As we know that C has only 50 students left the maximum it can share with A & B is 50
So, If A& C or B& C= 50. The left 150 has to be filled by A & B to give us a total of 500.
And if those 50 take up only C course. Then 200 students take A& B together.
IMO C & DHope this helps!
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