Find the sum of the base-2 geometric series $0.1_2-0.01_2+0.001_2-0.0001_2+0.00001_2\ldots$; give your answer as a fraction in which the numerator and denominator are both expressed in base 10.
Places to the right of the decimal point represent negative powers of the base, so we notice that the series in base 10 is $2^{-1}-2^{-2}+2^{-3}\ldots=\frac{1}{2}-\frac{1}{4}+\frac{1}{8}\ldots$. We recognize this as a geometric series with a common ratio of $-\frac{1}{2}$ and apply the formula $\frac{a}{1-r}$ for the sum of a geometric series with first term $a$ and common ratio $r$. We get $$\frac{\frac{1}{2}}{1-\left(-\frac{1}{2}\right)}=\frac{\frac{1}{2}}{\frac{3}{2}}=\frac{1}{3}.$$So, the sum of the geometric series is $\boxed{\frac{1}{3}}$.