Here is a Venn diagram. One of the numbers in the Venn diagram is picked at random. Find the probability that this number is in set C'

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