I swear, stats is going to be the death of me.

Suppose A is an event with probability 0.12 and B is an event with probability 0.51.

If A and B are mutually exclusive, determine the following probabilities:

P(AC or BC) =

If A and B are independent, determine the following probabilities:

P( AC or BC) =

meaning, NOT A, and NOT B

So for the first one, I thought it was 0.37 and 0.4312 for the second one, but apparently they are marking it wrong.

Formula should be

P(AC or BC) = 1 - P(A or B)

right?

why is it telling me it's wronggggg.

I got the P(A or B) correct for both, but why is P(NOT A and NOT B) wrong?

edit:

I accidentally did something to get the no response, ignore that. D;

I can't get the P(Ac or Bc) questions though. :|