Use the complementary events rule to answer the following probability questions:
a. If the probability that the stock market falls over the next two months is .4, what is the probability that the market will not fall over this time period?
b. If the probability that you will be late for work today is .8, what is the probability that you will not be late?
c. If the probability that both Jiao and Mary fail their next exam is .1, what is the probability that at least one of them passes?
d. If the probability that either France or Germany (or both) experiences an economic downturn next year is .75, what is the probability that neither will?