Can anyone help me out with the following question?
Q. What is the probability of the event that randomly selected composition of $n$ has a second part and that second part is $1$?
I know that the expected number, $E(X)$ that the first part of a randomly selected composition of $n$ is $2- 1/2^{n-1}$.
This problem is from 'A walk through Combinatorics' by Bona. Thanks,