I'm planning on writing a piece about math so I thought I'd survey my readers.

I assume that most of my readers took a lot of math in high school and college. Of all the math you learned, what parts of it do you use today as you do your system administration?

For example, of all the statistics I learned, pretty much all I actually use now is standard deviation. (and I just use it in analogies I make)

What path of your math education do you use today?

I tend to think this depends on how much programming you're doing - I find that that CS and programming specific stuff, like knowing the program you wrote will run in O(n) time can be useful to keep in the back of your head. Similarly, some parts of discreet mathematics, such as inductive proofs, set theory, and FSM's can come in handy at times.

But honestly much of what is taught is aimed at the physical and life sciences - things like geometry and calculus I haven't touched in years.