If the probability an event will occur is p and the probability it will not occur is​ q, then each term in the expansion of ​(p+​q)n represents a probability. The probability that a person suffers from a particular ailment is 0.15. If four people are randomly​ selected, the probability that two of them will suffer from the ailment is the third term of the binomial expansion of the binomial expression shown to the right. What is this​ probability?