Consider the type of clothes dryer (gas or electric) purchased by each of five different customers at a certain store.

a. If the probability that at most one of these purchases an electric dryer is 0.428, what is the probability that at least two purchase an electric dryer?

b. What is the probability that a randomly selected adult doesn't regularly consume at least one of these two products?

Please show vann diagram and all the necessary steps and details from the scratch as much as possible please. Thank you.