Wow, I've been saying that for a long time. I took algebra, calculus, and probability and statistics back in high school/ college. Guess which one I've used s

Wow, I've been saying that for a long time. I took algebra, calculus, and probability and statistics back in high school/ college. Guess which one I've used since then, and which two I have not used (with the exception of helping my children with their algebra homework).