Let the probability that the FTSE 100 increases today be 0.6 and the probability it goes up tomorrow be 0.7, and the probability that it increases both today and tomorrow be 0.50 Find the probability that it goes down or remains the same both today OR tomorrow.

So is the question asking for: .$\displaystyle P(A' \cap B')$=1- .$\displaystyle P(A \cap B)$=0.50 is this correct?