For what values of xxx does the series ∑n=1∞(x2)n\sum_{n=1}^{\infty} (\frac{x}{2})^n∑n=1∞(2x)n converge to 111?
x=2/3x=2/3x=2/3
x=4/3x=4/3x=4/3
x=1x=1x=1
x=1/2x=1/2x=1/2