The answer is 24/35. i would tell you to simplify but it is already in its simpliest form.
Answer:
This is an example of causation because the patient that took the medication recovered quicker than the patient that did not.
Step-by-step explanation:
Correlation is a statistical technique that shows that a relation exists between 2 variables but does not give any explanation about the relationship
Example: Correlation between Air Conditioner sales and sunglasses sold.
As the sales of the air conditioner is increasing so do the sales of sunglasses.
Causation is a statistical technique that shows a relation ship between 2 variable. It emphasizes the fact that any change in the value of one variable will cause a change in the value of another variable.
Consider such events:
A - slip with number 3 is chosen;
B - the sum of numbers is 4.
You have to count 
Use formula for conditional probability:

1. The event
consists in selecting two slips, first is 3 and second should be 1, because the sum is 4. The number of favorable outcomes is exactly 1 and the number of all possible outcomes is 5·4=20 (you have 5 ways to select 1st slip and 4 ways to select 2nd slip). Then the probability of event
is

2. The event
consists in selecting two slips with the sum 4. The number of favorable outcomes is exactly 2 (1st slip 3 and 2nd slip 1 or 1st slip 1 and 2nd slip 3) and the number of all possible outcomes is 5·4=20 (you have 5 ways to select 1st slip and 4 ways to select 2nd slip). Then the probability of event
is

3. Then

Answer: 