Are ALL formulas given in exam?

Hi guys I am home studying F9 (have just started a couple of weeks ago).

I notice that there are formula sheets provided in the exam paper. Up to now everything has been there that I needed.
However tonight in my studies I have got up to IRR in DCF techniques, and this formula doesnt appear to be there.

Are we expected to learn and remember that formula???!!!
Or will it be given in the question??

If we’re expected to learn and remember formulas and then calculate and interpret I may as well give up now!!

Any advice greatly appreceiated.