The probability that a randomly chosen person will believe a rumor about a politician's extramarital affair is 0.6. People from the public are randomly selected independently of one another at random. It is known that only one person between the first two selected believes the rumor. What is the probability that the sixth person who hears the rumor is the third person who believes roughly.
I don't understand why the answer is 3C2 * (0.6 ^ 2) * (0.4 ^ 2).