A rumor is spread randomly among a group of 10 people by successively having one person call someone, who calls someone and so on. A person can pass the rumor on to anyone except the individual who just called.
What is the probability that if A starts the rumor, A recieves the third call?
The Attempt at a Solution
I'm having difficulty getting started with this one. If person A starts the rumor, then the way the question is worded, it would appear that A could choose any ten people that happen to live on planet earth who happens to own a telephone. So that's got me real confused and I don't know how to start.