Consider the type of clothes dryer (gas or electric) purchased by each of ve di erent customers at a certain store.
a). If the probability that at most one of these customers purchases an electric dryer is :428, what is the probability that at least two purchase an electric dryer?
b) If P(all ve purchase gas)= .116 and P (all ve purchase electric)= .005, what is the probability that at least one of each type is purchased?