Expected value of general uniform order statistics

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I know that if $X_k$ ~ $Unif(0,1)$ and is order statistics, then $E[X_k] = \frac{k}{n+1}$.

What's $E[X_k]$ for when $X_k$ ~ $Unif(a,b)$?

I think it's $a + \frac{k}{n+1}(b-a).$ Can someone confirm?