Dear Friends,

I want to minimize the function $\displaystyle j\beta^{j-1}$, where $\displaystyle j\in\mathbb{N}$ and $\displaystyle \beta\in(0,1)$ by using Mathematica.

I have tried some codes but all failled.

One of them is

What should be the right code?Code:FindMinimum[j*\[Beta]^(j - 1), j \[Element] Integers && 1 <= j && \[Beta] < 1 && \[Beta] > 0, j]

Thanks for your interest.