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Is there a hard and fast rule, or even just a rule of thumb, for which formulas are “fair game” on the exam? I must say that I find CFAI to be very fair, but this is an area where they could provide a bit more guidance.
I have a few thoughts of my own:
1) I supposed that the default position is that anything in the curriculum could show up on the exam. This is the “better safe than sorry” approach.
2) Notwithstanding point 1, there are times when the author goes off into silly derivations that are essentially the mathematical equivalent of a run-on sentence and I feel pretty safe in ignoring these.
3) If a formula is used in a blue-box, I usually take that to be a hint that they recommend that you learn it.
4) I used to think that any formula with a blue-boxed number beside it was fair game and formulas without such notation could be ignored. But now I think that this is simply used when the author wants to reference an equation later in the reading.
Everything written above is purely speculation on my part, so if anyone can provide me with enlightenment on this subject it would be sincerely appreciated.