Respuesta :
I am pretty sure that is 10 hope this helped!
40+30+20=90 100-90= 10
:)
40+30+20=90 100-90= 10
:)
Answer: 50
Step-by-step explanation: The solution is 50.
n(D U M) = n(D) + n(M) - n(D ∩ M)
= 50 students
Therefore, there are 50 students left that do not have tickets to either sport.