The answer is C I’m pretty sure, it makes the most sense
Answer: It might be a no answer. I don't know which one. I'm so sorry if I'm wrong.
a. Use the inclusion/exclusion principle.
b. By definition of conditional probability,
all students = 150
M = 60
S = 45
M and S = 25
(a) At least one of the two requirements:
M or S = M + S - (M and S) = 60 + 45 - 25 = 80
(b) Exactly one of the two requirements:
(M or S) - (M and S) = 80 - 25 = 55
(c) Neither requirement:
(all students) - (M or S) = 150 - 80 = 70
What are the choices here