5. A box contains five numbered ping-pong balls. One ball has a number 1 painted on it, one ball has a 3, two of the balls are labeled with a 6, and one ball has an 8. The balls are picked from the box one at a time without replacement and placed in the order they are drawn, from left to right, to create a five-digit number. What is the probability that the five-digit number is a composite number (not prime)?