# Least odd natural number

Algebra Level 5

$\begin{cases} A_n=\left(\frac{3}{4}\right)-\left(\frac{3}{4}\right)^2+\left(\frac{3}{4}\right)^3+\cdots+(-1)^{n-1}\left(\frac{3}{4}\right)^n \\ B_n=1-A_n \end{cases}$

Find the least odd positive integer, $n_0$ such that $B_n>A_n$ for all $n \geq n_0$.

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