How to describe this structure in spoken words? $$\large f(0) = P(X = 0) = \frac{\binom{3}{0}\binom{17}{2}}{\binom{20}{2}} = \frac{68}{95},$$
I'm working on annotating math (probability and statistics) for the visually impaired that is to be read aloud by a screen reader and don't know what to put for this structure. 
As of now, I've just got something like, "$f$ of zero equals", then I am not sure how to phrase $P(X=0)$ (is it the probability where $X = 0? $), and then really have no idea about those structures in parentheses in the quotient portion. 
Thank you.
 A: There are so many different ways that you can do this. Fractions can be read as "[something] divided by [something else]", "numerator: [something] denominator: [something else]" or variations thereupon. Each version has its benefits, so I recommend experimenting with it. As for parenthesis, reading them out loud is not always necessary. In your example, you can get away with not reading them. Nonetheless, I think pauses after each function is helpful to the listener. Here is my recommendation:

"$f$ of $0$ [pause] equals the probability that $X$ equals $0$ [pause] equals $3$ chose $0$ [pause] times $17$ chose $2$ [pause] divided by $20$ chose $2$ [pause] equals $68$ $95^{\text{ths}}$"

A: I would read it as the probability that X equals zero, then three choose zero times seventeen choose two divided by twenty choose two.
A: "The probability that $X=0$ is equal to $3$ choose $0$ times $17$ choose $2$ in the numerator devided by $20$ choose $2$ in the denominator, which is equal to $68$ over $95$".
A: I feel that reading it like: $f (0)$ equals the probability of $X=0$ given by $3$ choose $2$ times $17$ choose $2$ divided by $20$ choose $2$ which equals $68$ over $95$. Hope it helps. 
A: If this is at a beginning level:

$f$ of zero equals the probability that $X$ equals $0$; this is a fraction whose numerator is $3$ choose $0$ times $17$ choose $2$, and whose denominator is $20$ choose $2$. This evaluates to the fraction $68$ over $95$.

If the students are a bit more advanced, you can compress it a bit:

$f$ of zero equals the probability that $X$ equals $0$, which is $3$ choose $0$ times $17$ choose $2$ all over $20$ choose $2$, which simplifies to $68$ over $95$.

