Unbiased estimator

If I want shows that $$\hat{b}$$ is an unbiased estimator for the b
where $$\hat{b}$$ = - $$\sum$$ ln xi /n
f(x)= $$\frac{1}{b}$$ e(1-b/b)

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If I want shows that $$\hat{b}$$ is an unbiased estimator for the b
where $$\hat{b}$$ = - $$\sum$$ ln xi /n
f(x)= $$\frac{1}{b}$$ e(1-b/b)