Question:
Rationalize the denominator: $\frac{1}{1 + \sqrt{2} - \sqrt{3}}$. The simplified result can be written in the form $\frac{\sqrt{2} + a + \sqrt{b}}{c}$, where $a$, $b$, and $c$, are positive integers. What is $a + b + c$?

Answer:
We begin by grouping terms in the denominator so that it resembles a two-term expression: $(1 + \sqrt{2}) - \sqrt{3}$. This suggests that our next step is to multiply both the numerator and the denominator of our original expression by $(1 + \sqrt{2}) + \sqrt{3}$ so that we have a difference of squares. Doing this, we have:  \begin{align*}
\frac{1}{1 + \sqrt{2} - \sqrt{3}} & = \frac{1}{(1 + \sqrt{2}) + \sqrt{3}} \times \frac{(1 + \sqrt{2}) + \sqrt{3}}{(1 + \sqrt{2}) - \sqrt{3}} \\
& = \frac{(1 + \sqrt{2}) + \sqrt{3}}{(1 + \sqrt{2})^2 - (\sqrt{3})^2} \\
& = \frac{1 + \sqrt{2} + \sqrt{3}}{(1 + 2\sqrt{2} + 2) - 3} \\
& = \frac{1 + \sqrt{2} + \sqrt{3}}{2\sqrt{2}}.
\end{align*}We can then rationalize the denominator of this expression by multiplying both the numerator and denominator by $\sqrt{2}$ to get: $$\frac{1 + \sqrt{2} + \sqrt{3}}{2\sqrt{2}} = \frac{1 + \sqrt{2} + \sqrt{3}}{2\sqrt{2}} \cdot \frac{\sqrt{2}}{\sqrt{2}} = \frac{\sqrt{2} + 2 + \sqrt{6}}{4}.$$Thus, $a = 2$, $b=6$, and $c=4$, so we have $a+b+c=2+6+4=\boxed{12}$.