Find the limiting distribution of $Z_n=n[1-F(Y_n)]$ Let $Y_n$ denote the maximum (the last order statistic) of a random sample of size $n$ from a distribution of the continuous type that has c.d.f $F(x)$ and pdf $f(x) = F'(x)$. Find the limiting distribution of $Z_n=n[1-F(Y_n)]$
I dont have the solution to this but the answer my teacher gave us is that the limiting distribution of $Z_n$ should be exponential with mean $1$. If you define $Z_n=n[1-Y_n]$ then that limiting distribution is exponential with mean $1$ but I dont know how to work with $F(Y_n)$

This is essentially the same idea given by  @user365239, but stated a little differently. 
Let $X_1,\dots,X_n$ be IID with DF $F$. Let $Y_n =\max_{j=1\dots n} X_j$. 
Let $Z_j = n(1-F(X_j))$. Then $Z_1,\dots,Z_n$ are IID, and observe that  
$$n(1-F(Y_n)) = \min_{j=1\dots n}Z_j.$$
Also, since  $F(X_j)\sim U[0,1]$, we also have  $1-F(X_j)\sim U[0,1]$, and so  $Z_j\sim U[0,n]$. 
From this we obtain: 
$$ P( \min_{j=1...n} Z_n > x) = P( U[0,n]>x)^n = (1-x/n)^n \to e^{-x},$$
where the second equality holds when $n>x$. 
