Given n(C) = 35, what is n(C)?

The question asks to find n(C). This value is directly provided in the problem statement.

Given:
n(C) = 35

Therefore,

$$n(C) = \boxed{35}$$

The other information provided (n(M), n(P), n(M ∩ C), n(P ∩ M), n(C ∩ P), and the statement "All study one of the 3") would typically be used to calculate the total number of students (n(M ∪ C ∪ P)) or the number of students studying all three subjects (n(M ∩ C ∩ P)), but these are not requested here.