Please help me solve these problems.

1. Nine boys and fourteen girls are arranged in a row in all possible ways. What is the average number of "neighbours" of opposite sex.

2. Consider a family of all $\displaystyle k$-element subsets of a set $\displaystyle \left\{ 1,2,......,2n\right\}$. For every such set consider its smallest element. Find the average value of the smallest element in all $\displaystyle k$-element subsets.