The probability that the selected number is in set C' is 5/6
How to determine the probability that this number is in set C'
From the question, we have the following parameters that can be used in our computation:
The Venn diagram
The count of numbers in the set C' is as follows
C' = A + B - C + None
So, we have
C' = 10
Also, we have
Total = 12
So, the probability is
P = 10/12
Evaluate
P = 5/6
Hence, the probability is 5/6