For P(C):
We know that P(A)= 0.32 and P(B) = 0.55
Then, P(A)+P(B) +P(C) = 1
Replacing:
0.32 + 0.55 +P(C) = 1
P(C) = 1-0.32 -0.55
P(C)=0.13
Now, we need to find Ac:
It means the complement of A, all the value that A needs to get 1 value:
Ac = 1- 0.32
Ac=0.68